וְלֹ֥א תִתְחַתֵּ֖ן בָּ֑ם בִּתְּךָ֙ לֹא־תִתֵּ֣ן לִבְנ֔וֹ וּבִתּ֖וֹ לֹא־תִקַּ֥ח לִבְנֶֽךָ׃
neither shalt thou make marriages with them: thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.
Targum Jonathan on Deuteronomy
You shall not intermarry with them; your daughters you shall not give to their sons, nor take their daughters for your sons; for whosoever marrieth with them is as if he made marriage with their idols.