Deuteronomy 7:2-3

2and when Jehovah thy 1GodH430 shall giveH5414 them up before thee and thou shalt smite them, then shalt thou utterly destroyH2763 them: thou shalt makeH5414 no covenantH1285 with them, nor shew mercy unto them.

3And thou shalt makeH5414 no marriages with them: thy daughterH1323 thou shalt not giveH5414 unto his sonH1121, nor takeH3947 his daughterH1323 for thy sonH1121;