Thematic Bible: The right of redemption resigned by a man's giving one of his shoes to the next of kin

Now for a long time in Israel there had been this custom concerning redemption or contracts, that for the confirmation of all matters: one plucked off his shoe and gave it to his neighbour, and this was a testimony in Israel. Therefore, the former owner of the right of redemption said unto Boaz, Buy it thyself. So he drew off his shoe.