When did Christians start meeting on a Sunday? Many assume that it’s a tradition that arose centuries after the apostles. And yet evidence survives within the Bible itself that churches began meeting on the first day of the week soon after the resurrection of Jesus on the first day of the week.
For instance, in Acts 29:7 we are told, “On the FIRST DAY of the week, when we met to break bread, Paul was holding a discussion with them; since he intended to leave the next day, he continued speaking until midnight.”
And Paul himself writes, in 1 Corinthians 16:2, that “On the FIRST of every week, each of you is to put aside and save whatever extra you earn, so that collections need not be taken when I come.”
So gathering, breaking bread, talks, and taking up collections, all things which we practice on a Sunday today, were practiced by the earliest churches on that same day.