Ishodad of Merv : [The king] could get no warmth from blankets, because blankets cannot provide warmth by themselves; if you put them on stones or corpses, they certainly cannot warm them; but when there is heat emanating from the inside of our body, then they are useful and are an aid for us, because they imprison the heat, which comes from the inside of our bodies and warms us up again. Therefore blankets were useless for David, so that it was prescribed by the wise men and the physicians that a young virgin was brought to him—and that was a real novelty—because heat and humidity are prevalent in the female sex, and especially in virgins. Indeed, she refreshed him through the humidity of her body and warmed him up with the heat of her blood, since it was evident that he suffered from both these distresses: coldness and dryness. — BOOKS OF SESSIONS 1 Kings 1:2