'Commit Adultery' in the Bible

Upon the heads of the mountains they will sacrifice, and upon the hills they will burn incense, under the oak and the white poplar and the terebinth, because its shadow was good: for this your daughters will commit fornication, and your brides shall commit adultery.

I will not review over your daughters when they shall commit fornication, and over your brides when they shall commit adultery: fur they will separate themselves with harlots, and with prostitutes will they sacrifice: and the people will not understand, they shall be thrown down.