Bava Metzia

GEMARA. How do we know it? — For our Rabbis taught: [Then the master of the house shall be brought unto the judges …] For all manner of trespass:  Beth Shammai maintain: This teaches that he is liable on account of [unlawful] intention just as for an [unlawful] act. But Beth Hillel say: He is not liable until he actually puts it to use, for it is said, [to see] whether he have put his hand unto his neighbour's goods. Said Beth Shammai to Beth Hillel: But it is already stated, For any word  of trespass! Whereupon Beth Hillel retorted to Beth Shammai: But it is already stated, [to see] whether he have put his hand unto his neighbour's goods! If so, what is the teaching of, for any word of trespass? For I might have thought: I know it only of himself;  whence do I know [that he is liable if] he instructed his servant or his agent [to use it]? From the teaching, For any word of trespass. IF HE INCLINES THE BARREL, etc. Rabbah said: This was taught only if it is broken: if, however, it soured, he must pay for the whole of it. Why? It was his arrows that affected it. BUT IF HE LIFTS IT, AND TAKES [A REBI'ITH] FROM IT, etc. Samuel said: 'TAKES' is not meant literally, but once he lifts it up in order to take [he is henceforth responsible] even if he does not take it. Shall we say that in Samuel's opinion [unlawful] use need not involve loss?  — I will tell you: That is not so, but here it is different, because he desires that the whole barrel shall be subservient to this rebi'ith. R. Ashi propounded: What then if he lifts up a purse in order to take a denar therefrom? Is it wine alone that can be guarded only by means of other wine,  whereas a zuz can be guarded [by itself]; or perhaps, the care given to a purse is not the same as that of a [single] denar?  The question stands. MISHNAH. GOLD ACQUIRES SILVER, BUT SILVER DOES NOT ACQUIRE GOLD; COPPER ACQUIRES SILVER, BUT SILVER DOES NOT ACQUIRE COPPER; CANCELLED COINS ACQUIRE CURRENT ONES, BUT CURRENT COINS DO NOT ACQUIRE CANCELLED COINS; UNCOINED METAL ACQUIRES COINED, BUT COINED METAL DOES NOT ACQUIRE UNCOINED METAL; MOVABLES ACQUIRE COINS, BUT COINS DO NOT ACQUIRE MOVABLES. THIS IS THE GENERAL PRINCIPLE:  ALL MOVABLES ACQUIRE EACH OTHER. E.G., IF [A] DREW INTO HIS POSSESSION [B'S] PRODUCE WITHOUT PAYING HIM THE MONEY, HE CANNOT RETRACT. IF HE PAID HIM THE MONEY BUT DID NOT DRAW INTO HIS POSSESSION HIS PRODUCE, HE CAN WITHDRAW. BUT THEY [SC. THE SAGES] SAID: HE WHO PUNISHED THE GENERATION OF THE FLOOD AND THE GENERATION OF THE DISPERSION,  HE WILL TAKE VENGEANCE OF HIM WHO DOES NOT STAND BY HIS WORD. R. SIMEON SAID: HE WHO HAS THE MONEY IN HIS HAND HAS THE ADVANTAGE.  GEMARA. Rabbi  taught his son R. Simeon: Gold acquires silver. Said he to him: Master, in your youth you did teach us, Silver acquires gold; now, advanced in age, you reverse it and teach, Gold acquires silver. Now, how did he reason in his youth, and how did he reason in his old age? — In his youth he reasoned: Since gold is more valuable, it ranks as money; whilst silver, which is of lesser value, is regarded as produce: hence [the delivery of] produce effects a title to the money. But at a later age he reasoned: Since silver [coin]