Here's a few verses:
On care and protection of "aliens" Deut 10:18, Ps 146:9, and Ex 22:21 "You shall not wrong or oppress a resident alien, for you were aliens in the land of Egypt".
Israel was condemned for oppressing aliens in Ps 94:6, and Ezek. 22:7,29
Number 15:15-16 "As for the...