Exodus 22:21 in the King James Version
Thou shalt neither vex a stranger, nor oppress him: for ye were strangers in the land of Egypt.
Context
20 “He who sacrifices to any god, except to the LORD only, shall be utterly destroyed.
21 “You shall not wrong an alien or oppress him, for you were aliens in the land of Egypt.
22 “You shall not take advantage of any widow or fatherless child.