Ruth 4:7-8

Darby(i) 7 Now this [was the custom] in former time in Israel concerning redemption and concerning exchange, to confirm the whole matter: a man drew off his sandal, and gave it to his neighbour, and this was the [mode of] attestation in Israel. 8 And he that had the right of redemption said to Boaz, Buy for thyself; and he drew off his sandal.