Commentaries:
Jamieson, Fausset, and Brown
Bless--that is, Call down by prayer a blessing on.
them which persecute you, etc.--This is taken from the Sermon on the Mount (Matthew 5:44), which, from the allusions made to it, seems to have been the storehouse of Christian morality among the churches.
Other commentary entries containing this verse:
Romans 12:17
Romans 12:19-21
Romans 12:21
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