7 But if the brother doesn't want to marry his sister-in-law, she is to go to the leaders at the city gate and say, "My brother-in-law refuses to keep his brother's name alive in Israel; he won't agree to do the brother-in-law's duty by me."

Matthew Henry's Commentary on Deuteronomy 25:7

Commentary on Deuteronomy 25:5-12

(Read Deuteronomy 25:5-12)

The custom here regulated seems to have been in the Jewish law in order to keep inheritances distinct; now it is unlawful.