(Deuteronomy 31):
[The LORD] will destroy these nations before you, and you shall dispossess them. Joshua is the one who will cross ahead of you, just as the LORD has spoken. “The LORD will do to them just as He did to Sihon and Og, the kings of the Amorites, and to their land, when He destroyed them. “The LORD will deliver them up before you, and you shall do to them according to all the commandments which I have commanded you.”
Then Joshua and all Israel with him went up from Eglon to Hebron, and they fought against it. They captured it and struck it and its king and all its cities and all the persons who were in it with the edge of the sword. He left no survivor, according to all that he had done to Eglon. And he utterly destroyed it and every person who was in it.
Samuel 15:3
"Go and attack the Amalekites! Destroy them and all their possessions. Don't have any pity. Kill their men, women, children, and even their babies. Slaughter their cattle, sheep, camels, and donkeys."
Brenton Septuagint
And now go, and thou shalt smite Amalec and Hierim and all that belongs to him, and thou shalt not save anything of him alive, but thou shalt utterly destroy him: and thou shalt devote him and all his to destruction, and thou shalt spare nothing belonging to him; and thou shalt slay both man and woman, and infant and suckling, and calf and sheep, and camel and ass.