'Bone' in the Bible

Then came all the tribes of Israel to David unto Hebron, and spake, saying, Behold, we are thy bone and thy flesh.

Ye are my brethren, ye are my bone and my flesh: wherefore then are ye the last to bring back the king?

And say ye to Amasa, Art thou not my bone and my flesh? God do so to me, and more also, if thou be not captain of the host before me continually in the room of Joab.