'Sandal' in the Bible

Now formerly in Israel this was the custom concerning redeeming and exchanging property. To confirm a transaction, a man pulled off his sandal and gave it to the other. This was the way of confirming and attesting in Israel.

So, when the closest relative (redeemer) said to Boaz, “Buy it for yourself,” he pulled off his sandal [and gave it to Boaz to confirm the agreement].

It is He [the preeminent One] who comes after me, the strap of whose sandal I am not worthy to untie [even as His slave].”