Leviticus 7:36

7:36 This is what the Lord commanded to give to them from the Israelites on the day Moses anointed them – a perpetual allotted portion throughout their generations.

Leviticus 24:8

24:8 Each Sabbath day Aaron must arrange it before the Lord continually; this portion is from the Israelites as a perpetual covenant.

Leviticus 25:44

25:44 “‘As for your male and female slaves who may belong to you – you may buy male and female slaves from the nations all around you.