Deuteronomy 25:7-9

7But if the man does not want to take his brother’s wife, then let his brother’s wife go up to the gate to the elders, and say, ‘My husband’s brother refuses to raise up a name to his brother in Israel; he will not perform the duty of my husband’s brother.’

8Then the elders of his city shall call him and speak to him. But if he stands firm and says, ‘I do not want to take her,’

9then his brother’s wife shall come to him in the presence of the elders, remove his sandal from his foot, spit in his face, and answer and say, ‘So shall it be done to the man who will not build up his brother’s house.’