In Ruth 3 and 4 Ruth approaches Boaz and offers herself to him. He is Naomi’s next-of-kin and as such has the right to redeem Elimelech’s property for her. He says that there is another relative who is closer to Naomi who needs to be consulted first before he can act.
Boaz approaches the other relative to see if he is willing to redeem the land. He is willing until he hears that Ruth would have to become his wife. So, the relative gives Boaz the right to redeem the land and to marry Ruth.
The rights of inheritance and succession have been restored, just as in the days of Tamar and Judah. Ruth bears a son who becomes the father of Jesse, who becomes the father of David, the future king of Israel. This is how Ruth, a Gentile woman, becomes named in the genealogy of Jesus in Matthew.
Boaz serves as Naomi’s kinsman redeemer. This is the role a next-of-kin plays to continue the family line and to maintain a family’s inheritance. Jesus is our kinsman redeemer. When we lost our inheritance because of our sin, Jesus stepped in and spoke on our behalf. He claimed us as his own and restored our inheritance as God’s children.
Psalm 45 appears to be a song for a royal wedding. The notes say that it is a love song. This is a marriage blessed of God.