Then Boaz said, “The day you acquire the field from the hand of Naomi, you are also acquiring Ruth the Moabite, the widow of the dead man, to maintain the dead man's name on his inheritance.”
and asked him a question, “Teacher, Moses wrote for us that if a man's brother dies, leaving a wife but no children, the man shall marry the widow and raise up children for his brother.
But if the man has no desire to marry his brother's widow, then his brother's widow shall go up to the elders at the gate and say, “My husband's brother refuses to perpetuate his brother's name in Israel; he will not perform the duty of a husband's brother to me.”