Ruth 4:7-10

7Now 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.

8And he that had the right of redemption said to Boaz, Buy for thyself; and he drew off his sandal.

9And Boaz said to the elders and all the people, Ye are witnesses this day, that I have bought all that was Elimelech's, and all that was Chilion's and Mahlon's, of the hand of Naomi;

10moreover Ruth the Moabitess, the wife of Mahlon, have I purchased to be my wife, to raise up the name of the dead upon his inheritance, that the name of the dead be not cut off from among his brethren and from the gate of his place: ye are witnesses this day.