'Heat' in the Bible

Now king David was old and stricken in years; and they covered him with clothes, but he gat no heat.

Wherefore his servants said unto him, Let there be sought for my lord the king a young virgin: and let her stand before the king, and let her cherish him, and let her lie in thy bosom, that my lord the king may get heat.

If there is no food in the land, or if there is disease, or if the fruits of the earth are damaged through heat or water, locust or worm; if their towns are shut in by their attackers; whatever trouble, whatever disease there may be:

When the king passed by, he called out to the king, "Your servant went out into the heat of the battle, and then a man turned aside and brought me a prisoner. He told me, 'Guard this prisoner. If he ends up missing for any reason, you will pay with your life or with a talent of silver.'