Ruth 4:5, 10

Then Boaz added, “The day you buy the field from the hand of Naomi, you also acquire Ruth the Moabite, the widow of the dead. Therefore, it will be your responsibility to father a child in order to maintain the dead man’s name on his inheritance.”

I have also acquired Ruth the Moabite, Mahlon’s widow, to be my wife. I will raise children with her who will maintain the dead man’s name on his inheritance so that the name of the dead may not be cut off from his village and from his family line. Today, you are witnesses of this transaction.”