Naomi and her daughter-in-law Ruth, both widowed, arrive in Bethlehem at the beginning of the barley harvest. The Lord gives His people bread again!
To provide for their livelihood, Ruth goes to gather ears of barley that the reapers drop in the field. The field turns out to belong to Boaz, a close blood relative of Naomi's deceased husband.
When Ruth comes home to Naomi in the evening with barley, Naomi informs her that Boaz is one of the redeemers. A redeemer (heb: go'el) is a close blood relative who, after the death of the husband - if no children have been born of the marriage - enters into (levirate-) marriage with the widow and begets a child with her. The child is then considered to be a child of the deceased spouse. In this way the heritage is preserved and the old age of the childless widow is assured.
Boaz - in contrast to a closer blood relative mentioned in chapter 4 - takes on the responsibility of the redeemer-ship and marries Ruth.
"And the LORD gave her that she should conceive and bear a son" verse 13.
The neighbors who visit Naomi name her grandson Obed, and praise the LORD, who has given her a redeemer through Ruth.
“They said: a son has been born to Naomi." Verse 17.
Obed becomes the father of Jesse, the father of David the king. Jesus Christ is "the Son of David".
In the Bible, the LORD is called the Redeemer. Psalm 19 verse 15. Job 19 verse 25.
For example, when the Israelites were enslaved in Egypt, God rose up as their Go'el to redeem them and give them an inheritance in the Promised Land.
The Father gives His Son Jesus Christ as a Redeemer.
The redeemer-ship in Israel was a prefiguration of this. Jesus “gives his soul a ransom for many” Matthew 20:28.
He became a “blood relative" to us by becoming human as God's Son; family of Adam and his descendants. Thus He became the Redeemer who paid the sin debt of the world.
“For God so loved the world that He gave His only begotten Son,
that whoever believes in Him should not perish, but have eternal life.” John 3 verse16.