Ruth 4:7-9

Now in those days it was the custom in Israel for anyone transferring a right of purchase to remove his sandal and hand it to the other party. This publicly validated the transaction. So the other family redeemer drew off his sandal as he said to Boaz, “You buy the land.” Then Boaz said to the elders and to the crowd standing around, “You are witnesses that today I have bought from Naomi all the property of Elimelech, Kilion, and Mahlon.