How do we know the importance of doctrine in fellowship?

In the Christian context, doctrine is not just theoretical; it represents the truths that bind believers together. The early church exemplified this in their steadfastness to apostolic teaching, which was crucial for maintaining unity. When doctrine is upheld, it creates a framework within which believers can engage in mutual support and worship without compromising their faith. Conversely, if fellowship extends beyond the limits of sound doctrine, it risks degenerating into a mere social bond devoid of Christ's true essence.