Boaz told Ruth that there was one problem with his plan to redeem her: there was a closer kin than Boaz in town who must have the first shot at her redemption.
Boaz met with the near kinsman. He was willing to redeem the land. But when he heard that he must also marry Ruth and raise up children in the name of her dead husband, he backed away from the deal and declared himself unable to redeem. And he asked Boaz to redeem her.
For christians, the nearer kinsman is the Law. It laid claims on us but was unable to redeem us. All that it could do was to condemn us as unworthy in its sight.
The Law made a feeble effort at redemption, but was unable to carry through to the end of the matter.
There are also other kinsmen out there who lay claims to us and try to redeem us. Things like the flesh, religion, good works, etc. They all make claims that they cannot keep.
Salvation is found in one palce and one place only. It is found in the Person of the LORD Jesus Christ (Acts 4:12. John 14:6, 8:24).
Remember Ruth, she found in Boaz the only qualified and willing savior.