A.T. Robertson Commentary Colossians 1:7

"even as ye learned of Epaphras our beloved fellow-servant, who is a faithful minister of Christ on our behalf," — Colossians 1:7 (ASV)

Of Epaphras (απο Επαφρα). "From Epaphras" who is the source of their knowledge of Christ.

On our behalf (υπερ ημων). Clearly correct (Aleph A B D) and not υπερ υμων (on your behalf). In a true sense Epaphras was Paul's messenger to Colossae.