In the second chapter of Ruth, Boaz saw Ruth working in his field and he wondered who the young woman was. In verses 5-16, when his hired men identified her, he approaches the young stranger and reveals the nature of his character.
First, he spoke to Ruth as an actual human being. The workers referred to her as the Moabite or as an outsider, but he addressed her as “daughter.”
Second, he let her know she could remain under his protection from possible abuse by young men. Not all the men working in the fields shared his concern for others.
And then he offered cool water to drink during the heat if the day. She could refresh herself by receiving from his provision for his workers, even though she worked for herself rather than for him.
Boaz did have a reason to be interested in Ruth: he was one of several possible kinsman-redeemers. Meanwhile, Ruth didn’t know what a kinsman-redeemer was.
This message identifies the purpose, obligations, and qualifications of a kinsman-redeemer. It also links Boaz to Jesus, because Jesus came to earth to become the kinsman-redeemer for all people.