Ketuvot 52a — Our Rabbis taught: If a woman was taken captive and a demand was made upon her husband for as much as ten times her value, he must ransom her the first time. Subsequently, however, he ransoms her only if he desired to do so but need not ransom her if he does not wish to do so. Rabban Simon ben Gamliel said: do not ransom captives for greater than their value, because of perfecting the world.
