'Perish' in the Bible

David said, "As Yahweh lives, Yahweh will strike him; or his day shall come to die; or he shall go down into battle and perish.

David said in his heart, "I shall now perish one day by the hand of Saul. There is nothing better for me than that I should escape into the land of the Philistines; and Saul will despair of me, to seek me any more in all the borders of Israel. So shall I escape out of his hand."