Exodus 23:2, 6, 9

Thou shalt not follow a multitude to do evil; neither shalt thou speak in a cause to turn aside after a multitude to wrest justice

Thou shalt not wrest the justice due to thy poor in his cause.

And a sojourner shalt thou not oppress: for ye know the heart of a sojourner, seeing ye were sojourners in the land of Egypt.