It was the Lord's will, I suppose.
Accordingly Paul lays down rules which he regarded as embodying the Lord's commandment.
There had already been other schisms on such questions as the right way to swing a censer and the legality of self-immolation for the Lord's sake.
But the most important offering was the solemn oblation in the assembly on the Lord's day.
Then after a prayer for sanctification, or for worthy reception, followed the Lord's Prayer, and after the Lord's Prayer the communion.