A.T. Robertson Commentary Matthew 22:24

"saying, Teacher, Moses said, If a man die, having no children, his brother shall marry his wife, and raise up seed unto his brother." — Matthew 22:24 (ASV)

Shall marry (επιγαμβρευσε). The Sadducees were "aiming at amusement rather than deadly mischief" (Bruce). It was probably an old conundrum that they had used to the discomfiture of the Pharisees. This passage is quoted from De 25:5,6. The word appears here only in the N.T. and elsewhere only in the LXX. It is used of any connected by marriage as in Ge 34:9; 1 Samuel 18:22. But in Ge 38:8 and De 25:5 it is used specifically of one marrying his brother's widow.