Leviticus 19:33-34, "And if a stranger sojourn with thee in your land, ye shall not vex him. 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."

Ruth was a Moabitess who was the widow of an Ephrathite. When faced with the possibility of loosing her mother-in-law, Naomi,  when she intended to return to her house in Bethlehemjudah, Ruth could not bear to leave her. Following her to the land of Israel Ruth vowed, "Do not urge me to leave you or turn back from following you; for where you go, I will go, and where you lodge, I will lodge. Your people shall be my people, and your God, my God."

When they returned to Israel Naomi told Ruth to do everything that she instructed her to do. Following her mother-in-law's instructions Ruth went into the field to glean with the others and was admired by a man named Boaz who was one of Naomi's relatives.

Leviticus 23:22, "And when ye reap the harvest of your land, thou shalt not make clean riddance of the corners of thy field when thou reapest, neither shalt thou gather any gleaning of thy harvest: thou shalt leave them unto the poor, and to the stranger: I am the LORD your God."

Following the Law as recorded by Moses, Boaz took Ruth to be his wife and together they became the ancestors of the most beloved king of all Israel, David.

The book of Ruth not only reveals the Law of God working in the life of a stranger but gives a clear and precise definition to the term kinsman redeemer.