Romans 12:20

But if thine enemy hunger, feed him; if he thirst, give him to drink: for in so doing thou shalt heap coals of fire upon his head.

Proverbs 25:21-22

If thine enemy be hungry, give him bread to eat; And if he be thirsty, give him water to drink:

Matthew 5:44

but I say unto you, love your enemies, and pray for them that persecute you;

Luke 6:27

But I say unto you that hear, Love your enemies, do good to them that hate you,

Exodus 23:4-5

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

1 Samuel 24:16-19

And it came to pass, when David had made an end of speaking these words unto Saul, that Saul said, Is this thy voice, my son David? And Saul lifted up his voice, and wept.

1 Samuel 26:21

Then said Saul, I have sinned: return, my son David; for I will no more do thee harm, because my life was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.

2 Kings 6:22

And he answered, Thou shalt not smite them: wouldest thou smite those whom thou hast taken captive with thy sword and with thy bow? set bread and water before them, that they may eat and drink, and go to their master.

Psalm 120:4

Sharp arrows of the mighty, With coals of juniper.

Psalm 140:10

Let burning coals fall upon them: Let them be cast into the fire, Into deep pits, whence they shall not rise.

Song of Songs 8:6-7

Set me as a seal upon thy heart, As a seal upon thine arm: For love is strong as death; Jealousy is cruel as Sheol; The flashes thereof are flashes of fire, A very flame of Jehovah.

Treasury of Scripture Knowledge

Summary

Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.

Bible References

If thine

Exodus 23:4
If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.
1 Samuel 24:16
And it came to pass, when David had made an end of speaking these words unto Saul, that Saul said, Is this thy voice, my son David? And Saul lifted up his voice, and wept.
1 Samuel 26:21
Then said Saul, I have sinned: return, my son David; for I will no more do thee harm, because my life was precious in thine eyes this day: behold, I have played the fool, and have erred exceedingly.
Proverbs 25:21
If thine enemy be hungry, give him bread to eat; And if he be thirsty, give him water to drink:
Matthew 5:44
but I say unto you, love your enemies, and pray for them that persecute you;

Coals

Psalm 120:4
Sharp arrows of the mighty, With coals of juniper.
Psalm 140:10
Let burning coals fall upon them: Let them be cast into the fire, Into deep pits, whence they shall not rise.
Song of Songs 8:6
Set me as a seal upon thy heart, As a seal upon thine arm: For love is strong as death; Jealousy is cruel as Sheol; The flashes thereof are flashes of fire, A very flame of Jehovah.

General references

Exodus 23:4
If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.
Proverbs 3:30
Strive not with a man without cause, If he have done thee no harm.
Proverbs 25:21
If thine enemy be hungry, give him bread to eat; And if he be thirsty, give him water to drink:
Matthew 5:42
Give to him that asketh thee, and from him that would borrow of thee turn not thou away.

American Standard Version Public Domain