TT #742 · Parashas Ki Seitzei · Seventh Aliyah · Passuk 25:09
Then his yevamah shall approach him in the presence of the elders, and draw his shoe off his foot, and spit in his face, and respond and say: “Thus shall be done to the man who will not build up his brother’s house.”
Torah Temimah points to Yevamot / Sifrei.
TT lemma: כָּכָה יֵעָשֶׂה לָאִישׁ.
כָּכָה יֵעָשֶׂה לָאִישׁ אֲשֶׁר לֹא יִבְנֶה אֶת בֵּית אָחִיו – זוֹ אֲמִירַת הַיְּבָמָה.
English: “Thus shall be done to the man who will not build up his brother’s house” — this is the declaration of the yevamah.
On the daf / in context: The formula publicly marks the consequence of the refusal.
The statutory declaration of the yevamah after the act.
After the physical acts, the yevamah recites the formula that describes the consequence of the yavam’s refusal.