Bible Notes Online - Ruth 4 - ESV
Commentary

v1: Boaz acted quickly to pursue and settle the claim upon Ruth. The gate was the public place where the elders of the city gathered, and where decisions were made.

v2: Boaz also gathered ten of the elders of the city, as witnesses of the transaction and decision.

v3: The redemption of the land is referred to in Lev 25.25-27.

v4-5: The nearer kinsman was willing to redeem the land, but not to carry out his responsibility to marry Ruth.

v6: The nearer kinsman could not redeem Ruth, lest he ruin his own inheritance; Deut 23.3; in this the nearer kinsman pictures the law, which can only condemn, but not show mercy. It is significant that this man is not named and is never referred to again.

v7-8: The sign of the sandal, simply to signify the agreement of the parties. This had apparently become gentler than the original command in Deut 5.8-9, where the widow spat in the face of the kinsman unwilling to provide for his family.

v9-10: The transaction was complete, Boaz had bought the land, and acquired his wife; there was cost, there was devotion, there was righteousness, as the requirements of the law were fulfilled. The result was simply that Ruth belonged to Boaz.

v11-12: The elders prayed a blessing on the redeemer, asking for fruitfulness through his wife.

v13-17: Naomi shared the blessing of Ruth, in contrast to 1.19-20. She is restored; "Obed" means restorer, so "he will renew your life and sustain you in your old age". The Lord God had restored Naomi, turning despair into hope, and giving her a future and dignity in Israel.

v18-22: The genealogy places Boaz, Ruth, and Obed into the line from Judah through to David, and ultimately to Christ.