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,

Deuteronomy 15:3

15:3 You may exact payment from a foreigner, but whatever your fellow Israelite owes you, you must remit.

Deuteronomy 32:7

32:7 Remember the ancient days;

bear in mind the years of past generations.

Ask your father and he will inform you,

your elders, and they will tell you.