Ruth 4:7-9

Now this was the custom in former times in Israel concerning redeeming and exchanging, to confirm anything: one man took off his sandal and gave it to the other, and this was a confirmation in Israel. Therefore the close relative said to Boaz, “Buy it for yourself.” So he took off his sandal. And Boaz said to the elders and all the people, “You are witnesses this day that I have bought all that was Elimelech’s, and all that was Chilion’s and Mahlon’s, from the hand of Naomi.