Strangers in Israel: Laws Respecting: Not to be Vexed or Oppressed
Source: TTT
Exodus 22:21
You must not exploit or oppress a foreign resident, for you yourselves were foreigners in the land of Egypt.
Exodus 23:9
Do not oppress a foreign resident, since you yourselves know how it feels to be foreigners; for you were foreigners in the land of Egypt.
Leviticus 19:33
When a foreigner resides with you in your land, you must not oppress him.