Ruth 4:5-8

5Then Boaz said, ‘You should also know this: When you buy the land from Naomi, you also have to marry the Moabite woman, Ruth. She is the widow of Elimelech's son. She will give birth to your children and Elimelech's land will continue to belong to his family.’

6When Boaz said that, the relative replied, ‘If that is true, I cannot buy the land. It would not belong to my own children when I die. You may buy the land instead of me. I cannot buy it myself.’

7In Israel at this time, when somebody agreed to sell land, he removed his shoe. He gave it to the man who was buying the land. Then everyone could see that they both agreed. They could not change their minds.

8So the relative said to Boaz, ‘You may buy the land.’ When he said that, he removed his shoe.