Talmud for Kiddushin 1:1
משנה האשה נקנית בשלש דרכים וקונה את עצמה בשתי דרכים נקנית בכסף ובשטר ובביאה בכסף בית שמאי אומרים בדינר ובשוה דינר ובית הילל אומרים בפרוטה ובשוה פרוטה וכמה היא פרוטה אחת משמונה באיסר האיטלקי וקונה את עצמה בגט ובמיתת הבעל היבמה נקנית בביאה וקונה את עצמה בחליצה ובמיתת היבם:
From when may one recite Shema in the evening? From the time the Kohanim go in to eat their Terumah (produce consecrated for priestly consumption). Until the end of the first watch, says Rabbi Eliezer. And the Sages say: Until [astronomical] midnight. Rabban Gamliel says: Until the break of dawn. It once happened that his [Rabban Gamliel’s] sons came from a house of feasting. They said to him: We have not recited Shema. He to them: If dawn has not broken, you are obligated to recite it. And it is not only in this case that they said it! Rather, in all cases where the Sages said "only until midnight," the obligation remains until the break of dawn. [e.g.] Burning the fats and limbs [of the sacrifices, on the Temple altar] — the obligation is until the break of dawn. [e.g.:] All [sacrifices] which may be eaten for one day — the obligation is until the break of dawn. If that is so, why did the Sages say, "until midnight?" To distance a person from transgression.
Jerusalem Talmud Bava Metzia
There is no doubt that gold or silver bars are merchandise, objects of trade and barter. The question is about coins. If gold coins are exchanged for silver coins and vice-versa, the question is which of the species are considered as merchandise and which as coins in the transaction. The Babli and all sources depending on it (Mishnah and Tosephta mss.) state that “Gold acquires silver but silver does not acquire gold,” the opposite of the Yerushalmi. The Halakhah states that originally, the Yerushalmi Mishnah was identical with the Babli; the change can be dated to the early Third Century.
D. Sperber has argued convincingly that this is not a question of gold or silver standard since both the Roman and the Parthian, later Persian, empires actually were on a gold-and-silver standard. But the Persian empire never experienced the disastrous manipulation of silver coinage which started with Caracalla and ended with the hyper-inflation of the military anarchy, only to be brought under control by Diocletian’s currency reform. By contrast, even the worst Roman emperors did not adulterate gold coinage (if they minted gold at all.) Therefore, in Babylonia silver coin was the common vehicle of trade while gold coin was used only in very large transactions or as a vehicle for hoarding. This means that silver coin was “money” but gold coin was “merchandise” even when gold coin did not trade at an agio over the official ratio. But in the Roman empire in the period of formulation of the Mishnah (roughly 190–230) silver coins changed from dependable vehicle of commerce to objects to be disposed of as quickly as possible; silver became a merchandise relative to gold coin.. Brass acquires silver but silver does not acquire brass3In good times, brass coins are local currency only which cannot be used at far-away places; they are tokens rather than coins. When tokens are exchanged for coins, the tokens are the merchandise. In bad times, when “silver” coins were brass coins slightly washed in a silver solution, brass coins did not exist.. Bad coins4Coins taken out of circulation; they are not money in the legal sense. acquire good ones but good ones do not acquire bad ones. A blank5Metal disks ready to be stamped in the mint. They are not money until stamped. acquires a coin but a coin does not acquire a blank. Movables acquire coins but coins do not acquire movables2It is accepted in rabbinic law (in the name of R. Yannai in Halakhah 4:2, in the Babli 46b in the name of R. Joḥanan) that in Biblical law money acquires both ownership and possession though this is denied in the other Yerushalmi Tractates in the name of R. Joḥanan, (Ševi‘it 8:1 Note 15, Erubin7:11 24d l. 3). But it is universally accepted that in rabbinic practice payment only establishes a claim to ownership and possession, not a fact. This is to avoid fraudulent transactions in which the seller sells non-existent goods and then claims that they were lost, e. g., by fire, between sale and delivery when they already were owned by the buyer but not yet in his possession. On the other hand, in a barter transaction taking possession by one party automatically transfers both ownership and possession to the other party (Qiddušin 1:6). If a person loses because the other party who took money in a commercial transaction then refuses to go through with the sale and offers to refund the money, he can ask the court to publicly curse the defaulting party but he has no legal way to force completion of the sale (Mishnah 2). But if the buyer took possession of the merchandise, then the sale is completed; the seller can force payment in court and is not required to take the article back. This means that transactions involving money are considered a kind of barter in which coins always are passive but never active objects of barter.
There is no doubt that gold or silver bars are merchandise, objects of trade and barter. The question is about coins. If gold coins are exchanged for silver coins and vice-versa, the question is which of the species are considered as merchandise and which as coins in the transaction. The Babli and all sources depending on it (Mishnah and Tosephta mss.) state that “Gold acquires silver but silver does not acquire gold,” the opposite of the Yerushalmi. The Halakhah states that originally, the Yerushalmi Mishnah was identical with the Babli; the change can be dated to the early Third Century.
D. Sperber has argued convincingly that this is not a question of gold or silver standard since both the Roman and the Parthian, later Persian, empires actually were on a gold-and-silver standard. But the Persian empire never experienced the disastrous manipulation of silver coinage which started with Caracalla and ended with the hyper-inflation of the military anarchy, only to be brought under control by Diocletian’s currency reform. By contrast, even the worst Roman emperors did not adulterate gold coinage (if they minted gold at all.) Therefore, in Babylonia silver coin was the common vehicle of trade while gold coin was used only in very large transactions or as a vehicle for hoarding. This means that silver coin was “money” but gold coin was “merchandise” even when gold coin did not trade at an agio over the official ratio. But in the Roman empire in the period of formulation of the Mishnah (roughly 190–230) silver coins changed from dependable vehicle of commerce to objects to be disposed of as quickly as possible; silver became a merchandise relative to gold coin.. This is the rule: all movables acquire one another6Mishnah Qiddušin 1:6..
Jerusalem Talmud Gittin
Jerusalem Talmud Bava Metzia
H. Y. D. Azulay, in his פתח עיניים, quotes from the ms. of R. Menaḥem di Lonzano בדיקלין באמה בדיקלין. E: אמלוקנין באמבוליקין.
However, Maimonides connects the statement with the later Mishnaiot whose subject is the cancellation of a sale because of overcharging by the seller or underpaying by the buyer. He reads the statement as meaning that a barter is concluded the moment one of the parties takes possession of the object coming to him, and no legal recourse exists for the party realizing that he made a bad bargain. He must hold that אברוקלון and אמבורוקלון are two different objects. It is possible that he reads the two words as “needle” and “silk cloth” since he writes (Mekhirah 13:1): “One who barters vessels agains vessels or animals against animals, even a needle for silk cloth or a kid goat for a horse, has no claim of overcharging since he might prefer a needle to silk cloth.” The horse is specifically exempt from the rules of overcharging in Halakhah 4, Note 132. (Ravad objects and thinks that Maimonides misunderstood the Yerushalmi.) The commentary Migdal ‘Oz (R. Šem-Ṭob Gabbai) readsאמבורקלין אמטרקלין, but gives no explanation of the words beyond noting that these clearly denote different objects..