For the phrase “If your enemies are hungry, give them bread to eat; and if they are thirsty, give them water to drink; for you will heap coals of fire on their heads,” see Romans 12:20.

Note that this quote in the New Testament is not taken from the Hebrew Bible but from the Greek Septuagint (LXX) which translates into English as “If your enemy is hungry, nourish him; if he is thirsty, give him to drink. For by doing this you will heap coals of fire on his head.” (Translation by NETS — for the Greek version see the title’s tooltip)