Rashi on Deuteronomy 25:10/רש"י על דברים כ״ה:י׳

1תקרא שמו וגו׳ AND HIS NAME SHALL BE CALLED [IN ISRAEL “THE HOUSE OF HIM THAT HATH HIS SHOE LOOSED”] — It is a duty of all those standing there to exclaim: חלוץ הנעל “O, you who have had your shoe drawn off!” (Sifrei Devarim 291:10; Yevamot 106b).