Ruth 4:5-8

5Then Boaz said, "The day you buy the field from the hand of Naomi, you also acquire Ruth the Moabite, the widow of the dead, in order to perpetuate the name of the dead in his inheritance."

6Then the redeemer said, "I cannot redeem it for myself, lest I impair my own inheritance. Take my right of redemption yourself, for I cannot redeem it."

7Now this was the custom in former times in Israel concerning redeeming and exchanging: to confirm a transaction, the one drew off his sandal and gave it to the other, and this was the manner of attesting in Israel.

8So when the redeemer said to Boaz, "Buy it for yourself," he drew off his sandal.