Bava Metzia (Talmudic Aramaic: בבא מציעא, "The Middle Gate") is the second of the first three Talmudic tractates in the order of Nezikin ("Damages"), the other two being Bava Kamma and Bava Batra. Originally all three formed a single tractate called Nezikin (torts or injuries), each Bava being a Part or subdivision. Bava Metzia discusses civil matters such as property law and usury. It also examines one's obligations to guard lost property that have been found, or property explicitly entrusted to him.
Bava Metzia contains 119 pages divided into ten chapters.
Honorary trustee ("Shomer Ḥinnam" chaps. i-v)
An honorary trustee is one who finds lost property. He has to keep it as "fines, are treated in ch. ii. 1; all other laws concerning the responsibilities and the rights of the shomer ḥinnam are contained in ch. iii. 4-12.
Sale and Trust (chap. iv)
Contains various laws concerning sale and exchange. The mere payment of money does not constitute the sale; and the buyer may legally cancel the sale and claim the return of the money, unless he has "drawn" the thing bought away from its place: this "drawing" ("meshikah") makes the sale final. Until such act is performed the seller is to some extent a shomer ḥinnam of the money paid. Similarly may the buyer become a shomer ḥinnam of the thing bought, if, on finding that he has been cheated, he wants to cancel the sale, to return the thing bought, and to claim the money back. What constitutes cheating ("onaah") is defined in the course of this chapter. (See Alienation).
Ch. v. deals with laws concerning interest, which have nothing in common with the laws concerning shomer ḥinnam beyond the fact that taking interest and cheating ("onaah" of chap. iv.) both consist of an illegal addition to what is actually due. The laws prohibiting the taking of interest are very severe, and extend to all business transactions that in any way resemble the taking of interest. The two terms for taking interest, "neshekh" (interest), and "tarbit" (increase), used in (Usury).
A paid trustee ("Shomer Sakhar", chaps. vi-vii)
A paid trustee is liable to pay for all losses except those caused by an accident ("ones"). He has to swear that such an accident happened, and is thereupon free from payment (ch. vii. 8-10). The example given in the Mishnah of shomer sakhar is that of an Deut 23:25-26).
Borrower ("Shoel", chap. viii.1-3)
A borrower or hirer is liable to pay for every kind of loss, including loss through accident, except "if the lender is with him" (Exodus 22:14); that is, according to the traditional interpretation, if the lender was likewise at work with him, for payment or without payment.
Hirer ("Sokher", chap. viii.6)
The laws of sokher having been given in chap. vi., as far as movable property is concerned, sections 6-9 of chap. viii. and 1-10 of chap. ix. treatment of the soker regarding immovable property; of the relations between the tenant of a house and his landlord, between the farmer of a field and its owner. Among the laws that regulate these relations are the following: If the tenant takes a house for a year, and the year happens to be a leap year, the tenant occupies the house thirteen months for the same price. The tenant can not be turned out in the winter between the Feast of Tabernacles (Sukkot) and Passover, unless notice be given one month before the beginning of the winter. In large towns and for shops, one year's notice is required.
Sections 11 and 12 of chap. ix, taking up again the subject of hiring, regulate the various terms for paying the due wages (based on Deut 24:6,10-13.
The concluding chapter (x) regulates the relations between joint owners and neighbors, in dwellings and in fields. The last case mentioned is especially interesting as showing a highly developed state of agricultural jurisdiction in the Mishnaic days.
Tosefta and Gemara
The Tosefta in Bava Metzia is divided into eleven chapters, which correspond to the ten chapters of the Mishnah in the following way: Chaps. i.-ii. correspond to chaps. i.-ii. of the Mishnah; chap. iii. to chaps. iii.-iv. of the Mishnah; chaps. iv.-vi. to chap. v. of the Mishnah; chap. vii.—which begins "he who hires workmen" ("po'alin") instead of "he who hires artisans" ("umanin") to Mishnah vi. 1; and chap. viii. correspond to chaps. vi.-viii. of the Mishnah; chaps. ix.-x. to chap. xi.; chap. xi. to chap. x. of the Mishnah.
The Gemara, in explaining the laws of the Mishnah, discusses a variety of kindred problems, especially the Babylonian Gemara; the Jerusalem being very meager in this respect. Rabbi Zeira, coming from Babylonia to Jerusalem, is said to have fasted a hundred times within a certain period of time, praying that he might forget the Babylonian Gemara, and fully grasp the teachings of Rabbi Johanan, the Jerusalem master (B. M. 85a). According to Rashi, the rabbis of Jerusalem were not of a contentious disposition, and settled difficulties without much discussion (compare p. 38b: "Are you from Pumbedita, where they make an elephant pass through the eye of a needle?").