Romans 12:20

Therefore if your enemy is hungry, feed him. If he thirsts, give him drink. For in so doing you will heap coals of fire on his head.

Proverbs 25:21-22

If your enemy is hungry, give him bread to eat. If he is thirsty, give him water to drink.

Matthew 5:44

I say love your enemies! Pray for those who persecute you!

Luke 6:27

I tell you who listen, love your enemies and do good to those who hate you.

Exodus 23:4-5

If you see your enemy's cow or donkey running loose, take it back to him.

1 Samuel 24:16-19

David, my son is that you? Saul asked. Then he started crying.

1 Samuel 26:21

My servant David, Saul said, I have sinned. Come back. I will not harm you again. You valued my life today. I have acted like a fool. I made a terrible mistake.

2 Kings 6:22

No, Elisha answered. Would you put to death soldiers you captured in combat? Give them something to eat and drink. Then let them return to their king.

Psalm 120:4

He will give you a warrior's sharpened arrows and red-hot coals.

Psalm 140:10

Let burning coals fall on them. Let them be thrown into a pit, never to rise again.

Song of Songs 8:6-7

(The Shulamite to her Beloved) Set me as a signature ring seal upon your heart, as a seal upon your arm. For Love is as strong as death. Zeal (devotion) is as fixed as the grave. And zeal burns like coals of fire, the 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 you see your enemy's cow or donkey running loose, take it back to him.
1 Samuel 24:16
David, my son is that you? Saul asked. Then he started crying.
1 Samuel 26:21
My servant David, Saul said, I have sinned. Come back. I will not harm you again. You valued my life today. I have acted like a fool. I made a terrible mistake.
Proverbs 25:21
If your enemy is hungry, give him bread to eat. If he is thirsty, give him water to drink.
Matthew 5:44
I say love your enemies! Pray for those who persecute you!

Coals

Psalm 120:4
He will give you a warrior's sharpened arrows and red-hot coals.
Psalm 140:10
Let burning coals fall on them. Let them be thrown into a pit, never to rise again.
Song of Songs 8:6
(The Shulamite to her Beloved) Set me as a signature ring seal upon your heart, as a seal upon your arm. For Love is as strong as death. Zeal (devotion) is as fixed as the grave. And zeal burns like coals of fire, the very flame of Jehovah.

General references

Exodus 23:4
If you see your enemy's cow or donkey running loose, take it back to him.
Proverbs 3:30
Argue with no one if they have never done you any harm.
Proverbs 25:21
If your enemy is hungry, give him bread to eat. If he is thirsty, give him water to drink.
Matthew 5:42
Give to those who ask. Lend to those who borrow.