Joshua 23:12

Else if ye do in any wise go back, and cleave unto the remnant of these nations, be joined to them in friendship and affection, even these that remain among you, and shall make marriages with them, thus entering into the most intimate relationship with them and setting aside the loyalty toward Jehovah, and go in unto them and they to you, in a social fellowship and intercourse which the Lord had forbidden them, Exodus 34:12; Deuteronomy 7:3,