Exodus 23:32

23:32 “You must make no covenant with them or with their gods.

Exodus 34:16

34:16 and you then take his daughters for your sons, and when his daughters prostitute themselves to their gods, they will make your sons prostitute themselves to their gods as well.

Deuteronomy 7:3

7:3 You must not intermarry with them. Do not give your daughters to their sons or take their daughters for your sons,

Joshua 23:12-13

23:12 But if you ever turn away and make alliances with these nations that remain near you, and intermarry with them and establish friendly relations with them, 23:13 know for certain that the Lord our God will no longer drive out these nations from before you. They will trap and ensnare you; they will be a whip that tears your sides and thorns that blind your eyes until you disappear from this good land the Lord your God gave you.