What did a widow remove from a brother-in-law who refused to carry on his brother's line?

Answer: His sandal

Before the elders she removed his sandal, spat in his face, and declared what is done to a man who will not maintain his brother's line.

“his brother’s widow shall go up to him in the presence of the elders, remove his sandal, spit in his face, and declare, “This is what is done to the man who will not maintain his brother’s line.””— Deuteronomy 25:9 (BSB)