Ruth

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’s brother shall go in unto her, and take her to him to wife, and perform the duty of an husband’s brother unto her.

Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is an hundred years old? and shall Sarah, that is ninety years old, bear?

Saying, Master, Moses wrote unto us, If any man’s brother die, having a wife, and he die without children, that his brother should take his wife, and raise up seed unto his brother.