Romans 12:20

If therefore thine enemy hunger, feed him; if he thirst, give him drink: for doing this, thou shalt heap up-coals of fire on his head.

Proverbs 25:21-22

If thine enemy hunger, give him bread to eat; and if he thirst, give him water to drink:

Matthew 5:44

But I say to you, Love your enemies, praise them cursing you, do well to them hating you, and pray for them threatening you, and driving you out.

Luke 6:27

But I say to you hearing, Love your enemies; do good to those hating you,

Exodus 23:4-5

If thou shalt meet thine enemy's ox or his ass wandering, turning back, thou shalt turn him back to him.

1 Samuel 24:16-19

And it will be as David finished speaking these words to Saul, and Saul will say, Is this thy voice, my son David? And Saul will lift up his voice and weep.

1 Samuel 26:21

And Saul will say, I sinned; turn back my son David: for I will no more, do to thee evil because that my soul was precious in thine eyes this day: behold, I was foolish, and I shall go very much astray.

2 Kings 6:22

And he will say, Thou shalt not strike: whom thou tookest captive with thy sword and with thy bow; strikest thou? set bread and water before them, and they shall eat and drink and go to their lord.

Psalm 120:4

Arrows of the strong one sharpened with burning coals of broom.

Psalm 140:10

Burning coals shall be shaken upon them; he shall cast them into fire, into whirlpools; they shall not rise up.

Song of Songs 8:6-7

Set me as a seal upon thy heart, as a seal upon thine arm: for love was strong as death; jealousy hard as hades: its flames, flames of fire, flames 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 shalt meet thine enemy's ox or his ass wandering, turning back, thou shalt turn him back to him.
1 Samuel 24:16
And it will be as David finished speaking these words to Saul, and Saul will say, Is this thy voice, my son David? And Saul will lift up his voice and weep.
1 Samuel 26:21
And Saul will say, I sinned; turn back my son David: for I will no more, do to thee evil because that my soul was precious in thine eyes this day: behold, I was foolish, and I shall go very much astray.
Proverbs 25:21
If thine enemy hunger, give him bread to eat; and if he thirst, give him water to drink:
Matthew 5:44
But I say to you, Love your enemies, praise them cursing you, do well to them hating you, and pray for them threatening you, and driving you out.

Coals

Psalm 120:4
Arrows of the strong one sharpened with burning coals of broom.
Psalm 140:10
Burning coals shall be shaken upon them; he shall cast them into fire, into whirlpools; they shall not rise up.
Song of Songs 8:6
Set me as a seal upon thy heart, as a seal upon thine arm: for love was strong as death; jealousy hard as hades: its flames, flames of fire, flames of Jehovah.

General references

Exodus 23:4
If thou shalt meet thine enemy's ox or his ass wandering, turning back, thou shalt turn him back to him.
Proverbs 3:30
Thou shalt not contend with man to no purpose, if he did thee no evil
Proverbs 25:21
If thine enemy hunger, give him bread to eat; and if he thirst, give him water to drink:
Matthew 5:42
To him asking thee, give thou, and him wishing to borrow from thee, thou shouldst not turn away.