John Gill Commentary Acts 15:6

"And the apostles and the elders were gathered together to consider of this matter." — Acts 15:6 (ASV)

And the apostles and elders came together
And also the brethren, or private members of the church, even the whole church, as appears from (Acts 15:22Acts 15:23) . Whether all the apostles were here present, is not certain; Peter, James, and John were; but who else, cannot be said: these met together

for to consider of this matter ;
to hear what was to be said on both sides of the question, and then to judge what advice was proper to be given to the Gentiles.