Commentaries:
Jamieson, Fausset, and Brown
fellow helper concerning you--Greek, "fellow worker towards you."
our brethren--the two mentioned in 2 Corinthians 8:18, 2 Corinthians 8:22.
messengers--rather, as the Greek, "apostles": in the less strict sense (Acts 14:14).
of the churches--sent by the churches, as we are by the Lord (Philippians 2:25). There was in the synagogue an ecclesiastical officer, called "the angel of the Church," whence the title seems derived (compare Revelation 2:1).
Other commentary entries containing this verse:
Acts 20:1-2
1 Corinthians 4:9
1 Corinthians 11:7-9
1 Corinthians 16:12
2 Corinthians 8:19
Philippians 2:25
1 John 3:20
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