the widow must walk over to him in the presence of the elders, pull his sandal from his foot, and spit in his face. Then she must declare, ‘This is what happens to a man who refuses to provide his brother with children.’
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.
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.