Leviticus 19:34
"But the stranger that dwelleth with you shall be unto you as one born among you, and thou shalt love him as thyself; for ye were strangers in the land of Egypt: I am the LORD your God."
Cross References (ranked by relevance)
Deuteronomy 10:19
Love ye therefore the stranger: for ye were strangers in the land of Egypt.
Leviticus 19:18
Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
Matthew 5:43
Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy.