Bede the Venerable
Catena Aurea · Lukasevangelium 6
Judge not, and ye shall not be judged: condemn not, and ye shall not be condemned: forgive, and ye shall be forgiven: Give, and it shall be given unto you: good measure, pressed down, and shaken together, and running over, shall men give into your bosom. For with the same measure that ye mete withal it shall be measured to you again.
Now in a short sentence he concisely sums up all that he had enjoined with respect to our conduct towards our enemies, saying, Forgive, and ye shall be forgiven, wherein he bids us forgive injuries, and shew kindness, and our sins shall be forgiven us, and we shall receive eternal life.