"Then all the tribes of Israel came to David at Hebron, and said, 'Look, we are your bone and flesh.'"This is part and parcel with by far my favorite view of Scripture, the marital view. "Your builder has come to marry you" as it says in Isaiah, as well as the Pauline teaching of the one Body of Christ made up of us (just as two become one in early marriage). It just doesn't get better, news-wise, than God not only created us, and forgives us, but wants to marry us and become one body with us.
This 2nd Samuel verse was an Adam and Eve reference and how the tribes basically are going to "marry" David, much as we Christians would "marry" Christ. And sure enough, I see Fr. Barron jumped on this as well:
Having come to David, the elders of the tribes say, “Look, we are your bone and flesh” (2 Sam. 5:1). They cannot mean a physical, tribal connection, for these are not men of Judah, but they do indeed assert that David is the head under which a kind of mystical body can form. No one familiar with the Bible can miss the connection between this language and the words used by Adam of Eve: “This at last is bone of my bones and flesh of my flesh” (Gen. 2:23). What the elders of Israel are proposing is a sort of marriage between themselves and David, a joining together of what had become separated, a union that will result in fruitfulness. Most Christians will recognize the link between this description of David’s relationship to Israel and Paul’s description of Jesus’s relationship to the church: “He [Christ] is the head of the body, the church” (Col. 1:18); and “now you are the body of Christ and individually members of it” (1 Cor. 12:27).