Ruth 4:4, 8

So I thought you ought to know about it. Buy it if you want. We can make it official in the presence of those here and in the presence of the elders of our people. As the kinsman-redeemer, you have the first right of refusal. Redeem it if you choose to, but if not, tell me so I will know, as I am next in line.” The man replied, “I’ll redeem it.”

So when the kinsman-redeemer said to Boaz, “Take my purchase option of redemption for yourself,” he took off his sandal and gave it to Boaz.