Leviticus 19:33,34

And if a stranger sojourn with thee in your land, ye shall not vex him.

If a stranger sojourn with thee. The Israelites were to hold out encouragement to strangers to settle among them, that these might be brought to the knowledge and worship of the true God; and with this view they were enjoined to treat such persons, not as aliens, but as friends, on the ground that they themselves, who were strangers in Egypt, were at first kindly and hospitably received in that country.