Deuteronomy 25:7
But if the man does not want to marry his brother's widow, she is to go to the elders at the city gate and say, "My husband's brother refuses to preserve his brother's name in Israel. He is not willing to perform the duty of a brother-in-law for me."

Deuteronomy 25:9
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."

Ruth 4:7
(Now in former times in Israel, concerning the redemption or exchange of property, to make any matter legally binding a man would remove his sandal and give it to the other party, and this was a confirmation in Israel.)