Ruth 4:7-9

Now this was the custom in former times in Israel concerning the redemption and the exchange of land to confirm any matter: a man removed his sandal and gave it to another; and this was the manner of attestation in Israel. So the closest relative said to Boaz, “Buy it for yourself.” And he removed his sandal. Then Boaz said to the elders and all the people, “You are witnesses today that I have bought from the hand of Naomi all that belonged to Elimelech and all that belonged to Chilion and Mahlon.