Bava Batra 89A

מ״והיה אם שמוע תשמע״, ועד ״לעבדם״; וקללן בעשרים ושתים ⁠– מ״והיה אם לא תשמע״ עד ״ואין קנה״.

from the letter vav that begins the verse: “And it should come to pass [vehaya], if you should hearken diligently” (Deuteronomy 28:1), until: “To serve them [le’ovdam]” (Deuteronomy 28:14), which ends with the letter mem. And he cursed them with 22 letters, from the letter vav that begins the verse: “But it should come to pass [vehaya], if you will not hearken to the voice of YHWH” (Deuteronomy 28:15), until: “And no man should buy [koneh]” (Deuteronomy 28:68). This verse ends with a letter heh, which comes just before vav in the alphabet. Starting with a vav and ending with a heh encompasses the 22 letters of the alphabet.

מקום שנהגו למוד בגסה כו׳. (סימן: אין מעיינין, ואין גודשין, באגרדמין, ובליטרא, שלשה, ועשר, נפש, משקלות, ממחק, עבה, לא תעשו, לא יעשה. )

§ The Mishnah teaches that in a place where they were accustomed to measure with one large measuring vessel, one may not measure with several small measuring vessels. In a place where the custom is to level the top of the measuring vessel to remove substances heaped above its edges, one may not heap it; and where they are accustomed to heap it, one may not level it. The Talmud provides a mnemonic for the ensuing halakhot: One may not balance with precision; and one may not heap it; with market inspectors [ba’agardamin]; and with a litra; 3; and 10; fulcrum; weights; a thick leveler; you may not do; one may not do.

תנו רבנן: מנין שאין מוחקין במקום שגודשין, ואין גודשין במקום שמוחקין? תלמוד לומר: ״איפה שלמה״.

A baraita states: From where is it derived that one may not level a measuring vessel in a place where they are accustomed to heap it and that one may not heap it in a place where they are accustomed to level it? The verse states: “A perfect weight” (Deuteronomy 25:15), which indicates that one must use whatever is considered a perfect measuring vessel in that locale, as this ensures that there is no deception or trickery.