Matthew Poole and continuators on Acts 15:23

23 And wrote letters by them after this manner , The apostles, and elders, and brethren send greeting unto the brethren which are of the Gentiles in Antioch, and Syria; and Cilicia.

The Letter was wrote in the name of them all, that it might have the greater force, and better acceptance; that so strong a Cord might not be broken by the false Apostles.

Such as out of Gentilism, or Paganism, were converted unto Christ; to whom the determination of this case was of greatest concern: their right of belonging unto Christ, and having any hopes of Salvation being questioned, unless they would be Circumcised.