'Fellow' in the Bible

And Saul and all the people that were with him assembled themselves, and they came to the battle: and, behold, every man's sword was against his fellow, and there was a very great discomfiture.

Have I need of mad men, that ye have brought this fellow to play the mad man in my presence? shall this fellow come into my house?

Now David had said, Surely in vain have I kept all that this fellow hath in the wilderness, so that nothing was missed of all that pertained unto him: and he hath requited me evil for good.

And the princes of the Philistines were wroth with him; and the princes of the Philistines said unto him, Make this fellow return, that he may go again to his place which thou hast appointed him, and let him not go down with us to battle, lest in the battle he be an adversary to us: for wherewith should he reconcile himself unto his master? should it not be with the heads of these men?