Genesis 38:8

Wife. This was then customary among the Chanaanites, as Philo insinuates. It also continued to be practiced in Egypt, till the year of Christ 491 at least, when the marriage had not been consummated. Moses established it as a law, when no issue had sprung from the deceased brother. (Calmet) (Deuteronomy xxv. 5.) The eldest son bore his name; the rest were called after their own father. This law is now abrogated; and the prohibition, which has been issued by the Church, can be dispensed with only by herself, (Worthington) as was the case in the marriage of Henry VIII, with Catherine, the virgin relict of his brother Arthur. (Haydock)