'Yourselves' in the Bible

So strengthen yourselves, and be valiant in heart, because your lord Saul has died, and the household of Judah has anointed me to be king over them."

And David said to Joab, and to all the people that were with him, Rend your garments, and gird yourselves with sackcloth, and mourn before Abner. And king David followed the bier.

And when you hear the sound of marching in the tops of the balsam trees, then you shall pay attention and act promptly, for at that time the Lord will have gone out before you to strike the army of the Philistines.”

And David said, What have I to do with you, you sons of Zeruiah, that you put yourselves against me today? is it right for any man in Israel to be put to death today? for I am certain today that I am king in Israel.