'Myself' in the Bible

Elijah said, "{As Yahweh of hosts lives}, before whom I stand, I will certainly show myself to him today."

Jezebel his wife said to him, "Now, you {rule} over Israel. Get up, eat food, and let your heart be {cheerful}. I myself will give you the vineyard of Naboth the Jezreelite."

Then the king of Israel said to Jehoshaphat, "[I will] disguise myself and go into the battle, but you wear your robes." So the king of Israel disguised himself, and he went into the battle.