Deuteronomy 25:5

English Standard Version

5 “If brothers dwell together, and one of them dies and has no son, the wife of the dead man shall not be married outside the family to a stranger. Her husband’s brother shall go in to her and take her as his wife and perform the duty of a husband’s brother to her. (Ge38:8; Ru1:12; Ru3:9; Mt22:24; Mr12:19; Lu20:28)

New International Version

5 If brothers are living together and one of them dies without a son, his widow must not marry outside the family. Her husband’s brother shall take her and marry her and fulfill the duty of a brother-in-law to her.

New Int. Readers Version

5 Suppose two brothers are living near each other. And one of them dies without having a son. Then his widow must not get married to anyone outside the family. Her husband's brother should marry her. That's what a brother‑in‑law is supposed to do.

King James Version

5 If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband' brother shall go in unto her, and take her to him to wife, and perform the duty of an husband' brother unto her.