Matthew 5:44

But I tell you, love your enemies and pray for those who persecute you,

1 Thessalonians 5:15

see that none of you pays back evil for evil, but always aim at what is kind to one another and to all the world;

Luke 6:27-28

I tell you, my hearers, love your enemies, do good to those who hate you:

Romans 12:17-21

Never pay back evil for evil to anyone; aim to be above reproach in the eyes of all;

Treasury of Scripture Knowledge

Summary

If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.

Bible References

General references

Matthew 5:44
But I tell you, love your enemies and pray for those who persecute you,
Luke 6:27
I tell you, my hearers, love your enemies, do good to those who hate you:
Romans 12:17
Never pay back evil for evil to anyone; aim to be above reproach in the eyes of all;
1 Thessalonians 5:15
see that none of you pays back evil for evil, but always aim at what is kind to one another and to all the world;