'Heat' in the Bible

otherwise the avenger of blood might pursue the manslayer in the heat of his anger, and overtake him, because the way is long, and take his life, though he was not deserving of death, since he had not hated him previously.

The Lord will smite you with consumption and with fever and with inflammation and with fiery heat and with the sword and with blight and with mildew, and they will pursue you until you perish.