How Did Christians Learn Doctrine Before Complete Bibles?

Question 0037.

It is a fair question, and the answer turns on the apostolic teaching that filled the gap before the New Testament was gathered into one book. The earliest Christians did not walk around with a leather-bound Bible containing all sixty-six books. The church was born at Pentecost, and the Gospels and letters were written across the decades that followed. So how did those first believers come to know sound doctrine without the complete Scriptures we hold so easily today?

When I sit with this question I find both a great comfort and a gentle rebuke. The comfort is that God preserved his truth through living apostolic teaching long before the ink of the last book was dry. The rebuke is that I, who own several Bibles, often treasure the truth far less than those who received it by word of mouth and guarded it with their lives. Let me trace how the apostolic teaching actually worked.

What the First Believers Already Had

The earliest church was not starting from nothing. The believers had what we now call the Old Testament, the Hebrew Scriptures that Jesus himself said testified about him (John 5:39). On the road to Emmaus he opened “Moses and all the Prophets” to show how they spoke of him (Luke 24:27). The Bereans were commended precisely because they “examined the Scriptures daily to see if these things were so” (Acts 17:11). So the foundation of written revelation was already in their hands.

What they lacked was the written record of the gospel events and the apostolic letters that interpret them. Into that space stepped the living voice of those who had walked with Jesus. The Old Testament gave them the soil. The apostolic teaching planted the gospel in it. The two were never set against each other, for the apostles preached Jesus straight out of the Scriptures they already shared with their hearers.

The Foundation of Apostolic Teaching

Luke tells us exactly what the first church devoted itself to. “They devoted themselves to the apostles’ teaching and the fellowship, to the breaking of bread and the prayers” (Acts 2:42). Notice what comes first. Before the buildings, before the programmes, before anything we might think of as church life, there was the apostolic teaching, and the young church gave itself to it wholeheartedly.

Why the apostles? Because they were the appointed eyewitnesses, the men Jesus had personally taught and commissioned, on whom the Spirit came to bring his words to their remembrance (John 14:26). Paul calls the church a building “built on the foundation of the apostles and prophets, Jesus himself being the cornerstone” (Ephesians 2:20). A foundation is laid once. The apostolic teaching was that foundation, authoritative because it came from the men Jesus had chosen to deliver his truth to the world.

This teaching was not loose or improvised. Paul speaks of “the pattern of the sound words” and of a deposit to be guarded (2 Timothy 1:13-14). He praises the Romans for becoming “obedient from the heart to the standard of teaching to which you were committed” (Romans 6:17). There was a recognised body of apostolic teaching, a settled shape of truth, handed on with care from the very beginning. It was not a vague spirituality but a definite content that could be received, kept, and passed on intact.

Handed On From Faithful to Faithful

The truth travelled by being entrusted from one reliable person to another. Paul’s charge to Timothy captures the whole method: “What you have heard from me in the presence of many witnesses entrust to faithful men, who will be able to teach others also” (2 Timothy 2:2). There are four links in that one sentence, Paul to Timothy to faithful men to others, and the cargo carried along the chain is the apostolic teaching.

This is why the early church took such trouble to test teachers and to remember the words of the apostles accurately. They were not preserving private opinions. They were guarding the deposit of truth on which their souls depended. When false teachers arose, the answer was always to measure them against what the apostles had delivered, just as Paul told the Galatians that even an angel preaching another gospel was to be rejected (Galatians 1:8).

I find it striking how seriously they took the chain. A church that lost the apostolic teaching would not simply be a little less informed. It would be cut off from its own foundation, drifting on whatever current happened to be strongest. So the careful handing on of truth was not pedantry. It was survival, and the believers knew it.

From Living Voice to Written Word

The spoken apostolic teaching did not stay only a matter of memory. As the apostles aged and the church spread, that same teaching was committed to writing under the carrying of the Holy Spirit, and those writings are our New Testament. The letters were read aloud in the gatherings, copied, and circulated from church to church (Colossians 4:16). The written word did not replace the apostolic teaching. It is the apostolic teaching, set down permanently and kept from drifting.

I find that a beautiful providence. God did not leave his church forever dependent on fallible human memory. He saw to it that the foundational teaching of the apostles was fixed in a book that no later generation could quietly alter. The same Spirit who inspired the writing also gathered and preserved it, which is why I can hold the completed Scriptures today and know they carry the very truth the first believers received by voice.

Why This Still Matters for Me

The lesson for my own day is sharp. The early church did not learn doctrine by chasing private impressions or by trusting whatever happened to feel true. They learned it by submitting to the recognised apostolic teaching, and I am called to do exactly the same, except that I now have that teaching complete and in writing. If they guarded the deposit so jealously when it came by word of mouth, how much more should I treasure it now that it sits open on my desk.

It also rebukes the modern habit of treating doctrine as optional. The first thing the newborn church devoted itself to was teaching, and a church that drifts from sound doctrine is drifting from its own foundation. If you want to think more about why this matters, I have written on what doctrine is and why it matters and on which doctrines are essential for salvation.

The Same Deposit in Our Hands

When I hold my Bible I am holding the very apostolic teaching that the first believers gave their lives to receive and guard. Nothing has been lost in the handing on. The deposit Paul told Timothy to keep is the deposit I now read in the morning. That continuity is one of the quiet wonders of the Christian faith, a line of truth running unbroken from the upper room to my kitchen table.

So the question is not whether the apostolic teaching has reached us, for plainly it has. The question is what I will do with it now that it has. The early church had every disadvantage and treasured the truth. I have every advantage and too often neglect it. That contrast is worth sitting with until it changes how I open the book tomorrow.

A Faith Built to Be Handed On

One thing that strikes me about the whole arrangement is how deliberately the truth was made to travel. God did not entrust his gospel to a single book locked in a temple, nor to one teacher who could carry it to the grave. He gave it to a community, taught it through eyewitnesses, and built into it the command that each generation pass it faithfully to the next. The faith was designed from the start to be received, treasured, and handed on intact.

That design still shapes how the church ought to work today. I am not meant to invent my Christianity afresh, nor to receive it in private from my own impressions. I am meant to take my place in the long line of those who received the deposit, held it without loss, and passed it on. When I teach the young believers in my care, I am simply doing what was done for me, and what was done for the very first disciples, keeping the chain unbroken for one more link.

So, now what?

Let the example of the first believers shame our casualness in the best possible way. They had no printed Bibles, no study apps, no shelves of commentaries, and yet they devoted themselves to the apostles’ teaching as though their lives depended on it, because they did. You and I have the completed Scriptures within arm’s reach. The question is not whether the truth is available to us. It is whether we will give ourselves to it as they did.

So make the apostolic teaching, now bound in your Bible, the thing you devote yourself to first. Not your feelings about God, not the latest voice with a microphone, but the settled deposit handed down from the men Jesus appointed. If the early church could build on that foundation without a single completed New Testament, what excuse have we who hold the whole of it? Will you start treating it like the treasure it is?

And they devoted themselves to the apostles’ teaching and the fellowship, to the breaking of bread and the prayers.

Acts 2:42 (ESV)