Commentaries:
Adam Clarke
Certain which went out from us - So the persons who produced these doubtful disputations at Antioch, etc., had gone out from the apostles at Jerusalem, and were of that Church: persons zealous for the law, and yet, strange to tell, so conscientiously attached to the Gospel that they risked their personal safety by professing it.
To whom we gave no such commandment - As, therefore, they went out from that Church, they should have taught nothing which was not owned and taught by it; much less should they have taught in opposition to it.
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