Deuteronomy 7:16 in the King James Version
And thou shalt consume all the people which the LORD thy God shall deliver thee; thine eye shall have no pity upon them: neither shalt thou serve their gods; for that will be a snare unto thee.
Context
15 The LORD will take away from you all sickness; and he will put none of the evil diseases of Egypt, which you know, on you, but will lay them on all those who hate you.
16 You shall consume all the peoples whom the LORD your God shall deliver to you. Your eye shall not pity them. You shall not serve their gods; for that would be a snare to you.
17 If you shall say in your heart, “These nations are more than I; how can I dispossess them?”