18: And she took it up and went into the city. Her mother-in-law saw what she had gleaned. She also brought out and gave her what food she had left over after being satisfied.
Ruth kept the extra food so that she could give it to her mother-in-law to eat. I imagine Naomi’s eyes being the size of saucers when she saw how much food that Ruth brought back. The city is Bethlehem. We can know this because verse 19 from chapter one says that they traveled until they came to Bethlehem. We can also know this because Naomi’s family was from Bethlehem before they went to Moab. Who else happens to be from Bethlehem? Boaz (2:4).
19: And her mother-in-law said to her, “Where did you glean today? And where have you worked? Blessed be the man who took notice of you.” So she told her mother-in-law with whom she had worked and said, “The man’s name with whom I worked today is Boaz.”
Naomi seems surprised by Ruth’s gleanings and seeks out more information. She recognizes that someone must have taken notice of her and watched out for her in order for her to have gleaned so much food.
20: And Naomi said to her daughter-in-law, “May he be blessed by the Lord, whose kindness has not forsaken the living or the dead!” Naomi also said to her, “The man is a close relative of ours, one of our redeemers.”
Naomi’s first response is that the Lord bless Boaz and then she thanks God for not forsaking them. At the end of chapter one, Naomi believed that the Lord had testified against her, but now she can see that He is looking out for her and Ruth. Naomi also tells Ruth that Boaz is a relative of hers. This did not come up in the conversation between her and Boaz so we could guess that she had not known his relation to them before this point.
A redeemer in that time was a relative who could continue the family line so that it wouldn’t be broken. Often times when a woman was widowed without a child, in order to carry on the family line, the brother of the deceased would marry the widow and the first child born would be considered the child of the deceased and therefore inherit everything and carry on that family line. This can be seen in the book of Genesis when Judah’s son, Er, died. Judah’s second son, Onan, was to raise up offspring for his brother, but disobeyed and died because of that*. I’ll end the story there because it is long and complicated, but that is an example of the law that was in place.
We can learn from these verses that God is watching out for us. Everything seemed hopeless to Naomi, but in one day she realized that God was looking out for them by leading Ruth to Boaz’s field and having Boaz look out for Ruth. I also wonder that if this is the point where Naomi begins planning the events that happen in chapter three.
* Genesis 38:1-30 (This story also has an importance when going through the genealogy at the end of chapter four)