his sister-in-law, in the presence of the elders, shall go up to him and strip his sandal from his foot and spit in his face, declaring, “This is how one should be treated who will not build up his brother’s family!”
Now it used to be the custom in Israel that, to make binding a contract of redemption or exchange, one party would take off a sandal and give it to the other. This was the form of attestation in Israel.
Boaz then said to the elders and to all the people, “You are witnesses today that I have acquired from Naomi all the holdings of Elimelech, Chilion and Mahlon.