'Bone' in the Bible

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

Ye are my brethren, ye are my bone and my flesh; and why will ye be the last to bring back the king?

And say 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 instead of Joab.