Ruth 4:5, 10

Then Boaz said, “On the day you buy the field from the hand of Naomi, you must also buy it from Ruth the Moabitess, the wife of the dead, to perpetuate the name of the dead through his inheritance.”

Moreover, Ruth the Moabitess, the widow of Mahlon, I have acquired as my wife, to perpetuate the name of the dead through his inheritance, that the name of the dead may not be cut off from among his brethren and from his position at the gate. You are witnesses this day.”