Deuteronomy 7:3,4
Neither shall you make marriages with them; your daughter you shall not give to his son, nor his daughter shall you take to your son.
Torrey's Topical Textbook—AKJV

Joshua 23:12
Else if you do in any wise go back, and join to the remnant of these nations, even these that remain among you, and shall make marriages with them, and go in to them, and they to you:
Torrey's Topical Textbook—AKJV

Ezra 9:11,12
Which you have commanded by your servants the prophets, saying, The land, to which you go to possess it, is an unclean land with the filthiness of the people of the lands, with their abominations, which have filled it from one end to another with their uncleanness.
Torrey's Topical Textbook—AKJV