Ruth 4:6-8

6The man replied, “In that case I cannot assume responsibility for her. If I did, I would ruin my inheritance. Take all my rights to buy back the property for yourself, because I cannot assume that responsibility.”

7(This is the way it used to be in Israel concerning buying back property and exchanging goods: In order to make every matter legal, a man would take off his sandal and give it to the other man. This was the way a contract was publicly approved in Israel.)

8So when the man said to Boaz, “Buy it for yourself,” he took off his sandal.