Deuteronomy 25:8-10

8Then the elders of his city shall call him, and speak to him: and if he shall stand to it, and say, I desire not to take her; 9Then shall his brother’s wife come to him in the presence of the elders, and loose his shoe from off his foot, and spit in his face, and shall answer and say, So shall it be done to that man that will not build up his brother’s house. 10And his name shall be called in Israel, The house of him that hath his shoe loosed.