Deuteronomy 25:7
But if the man does not want to marry his brother's widow, then she must go to the elders at the city gate and declare, "My husband's brother refuses to perform the duty of a brother-in-law in order to preserve the name of his brother in Israel. He is not willing to perform the duty of a brother-in-law.'
Ruth 4:1-2
Meanwhile, Boaz approached the city gate and sat down there. Just then, the very same related redeemer whom Boaz had mentioned came by, so Boaz called out to him, "Come over and sit down here, my friend!" So the man came over and sat down.
Ruth 4:5-6
Boaz continued, "On the very day you buy the field from Naomi, you're also "buying" Ruth the Moabite woman, the wife of her dead husband, so the family name may be continued as an inheritance."