ISB ~ 2 Corinthians 2 v17

not, like so many, peddlers:Refers to the missionary intruders in Corinth, later called “false apostles” (11:13). Paul exposes their hidden agenda, calling them salesmen of the gospel who preach, not for the glory of God, but for the sake of personal profit. Paul is exempt from such a charge since he accepts no financial support at all from the Corinthians (11:711; 1 Cor 9:7-15).

See introduction:Destination.