Thomson(i)
7 Now it was the custom heretofore in Israel, in regard to the transfer of the right of consanguinity, in order to give it validity, that the man loosed his sandal, and gave it to his neighbour, who took upon him his right of consanguinity, and this was the evidence in Israel.
8 So when the relation said to Boaz, Purchase thou for thyself, what by the law of consanguinity it was my right to purchase, he loosed his sandal, and gave it to him.