Romans 12:20

Therefore if your enemy hungers, feed him; if he thirsts, give him drink: for in so doing you shall heap coals of fire on his head.

Proverbs 25:21-22

If your enemy is hungry, give him bread to eat; and if he is thirsty, give him water to drink:

Matthew 5:44

But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them who despitefully use you, and persecute you;

Luke 6:27

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

Exodus 23:4-5

If you meet your enemy's ox or his donkey going astray, you shall 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 your 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 you harm, because my soul was precious in your eyes this day: behold, I have played the fool, and have erred exceedingly.

2 Kings 6:22

And he answered, You shall not slay them: would you slay those whom you have taken captive with your sword and with your 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, that they rise not up again.

Song of Songs 8:6-7

Set me as a seal upon your heart, as a seal upon your arm: for love is as strong as death; jealousy is cruel as the grave: its flames are flames of fire, a most vehement flame.

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 meet your enemy's ox or his donkey going astray, you shall 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 your 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 you harm, because my soul was precious in your eyes this day: behold, I have played the fool, and have erred exceedingly.
Proverbs 25:21
If your enemy is hungry, give him bread to eat; and if he is thirsty, give him water to drink:
Matthew 5:44
But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them who despitefully use you, and 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, that they rise not up again.
Song of Songs 8:6
Set me as a seal upon your heart, as a seal upon your arm: for love is as strong as death; jealousy is cruel as the grave: its flames are flames of fire, a most vehement flame.

General references

Exodus 23:4
If you meet your enemy's ox or his donkey going astray, you shall surely bring it back to him again.
Proverbs 3:30
Strive not with a man without cause, if he has done you no harm.
Proverbs 25:21
If your enemy is hungry, give him bread to eat; and if he is thirsty, give him water to drink:
Matthew 5:42
Give to him that asks you, and from him that would borrow of you turn not away.