Verses with the word harlots in the Old Testament (3 verses):

1 Kings 3:16
Then came there two women, that were harlots, unto the king, and stood before him.

Proverbs 29:3
Whoso loveth wisdom rejoiceth his father: but he that keepeth company with harlots spendeth his substance.

Hosea 4:14
I will not punish your daughters when they commit whoredom, nor your spouses when they commit adultery: for themselves are separated with whores, and they sacrifice with harlots: therefore the people that doth not understand shall fall.