Shabbat

But does he not harden it? — This agrees with R. Simeon, who ruled: That which is unintentional is permitted.  Abaye demurred to this: Is it then stated, A BOILER from which the water IS REMOVED: Surely it is stated, IF A BOILER IS REMOVED? Rather said Abaye, this is the meaning: If a boiler is removed [from the fire] and it contains hot water, one must not pour therein a little water to heat it [the added water], but he may pour a large quantity of [cold] water therein to temper it.  But if the water is removed from a boiler, no water at all may be poured therein, because that hardens it; this agreeing with R. Judah, who maintains: [Even] that which is un-intentional is forbidden. Rab said: They taught [that it is permitted] only to temper [the water]; but if it is to harden [the metal], it is forbidden. Whereas Samuel ruled: Even if to harden it, it is still permitted. If the primary purpose is to harden it, can it be permitted!  Rather if stated, it was thus stated: Rab said: They taught this only where there is [merely] a sufficient quantity to temper it; but if there is enough to harden it, it is forbidden.  Whereas Samuel maintained: Even if there is a sufficient quantity to harden it,