'Bone' in the Bible

Then came all the tribes of Israel to David to Hebron, and spoke, saying, "Behold, we are your bone and your flesh.

You are my brothers, you are my bone and my flesh. Why then are you the last to bring back the king?'

Say to Amasa, 'Aren't you my bone and my flesh? God do so to me, and more also, if you aren't captain of the army before me continually in the room of Joab.'"