'Adultery' in the Bible

Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds.

because His judgments are true and righteous. He has judged [convicted and pronounced sentence on] the great prostitute (idolatress) who was corrupting and ruining and poisoning the earth with her adultery (idolatry), and He has imposed the penalty for the blood of His bond-servants on her.”