9 the widow must walk over to him in the presence of the elders, pull his sandal from his foot, and spit in his face. Then she must declare, 'This is what happens to a man who refuses to provide his brother with children.'

Matthew Henry's Commentary on Deuteronomy 25:9

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.