Halakhah for Bava Batra 176:2
מקום שנהגו למוד בדקה לא ימוד בגסה בגסה לא ימוד בדקה למחוק לא יגדוש לגדוש לא ימחוק:
A TENTH<span class="x" onmousemove="('comment',' This is explained in the Gemara, infra. ');"><sup>4</sup></span> IN [THE CASE OF] LIQUIDS AND A TWENTIETH IN [THE CASE OF] DRY [PROVISIONS]. WHERE THE USAGE IS TO MEASURE WITH A SMALL [UNIT], ONE MUST NOT USE A BIG MEASURE; [IF THE USAGE IS TO MEASURE] WITH A BIG [UNIT], ONE MUST NOT USE A SMALL MEASURE. [IF THE USAGE IS] TO STRIKE [THE MEASURE],<span class="x" onmousemove="('comment',' By removing what is above the level of its top. ');"><sup>5</sup></span> [ONE MUST] NOT HEAP [IT UP]. [IF THE USAGE IS] TO HEAP [IT UP], ONE MUST NOT STRIKE IT.
Kitzur Shulchan Arukh
You should measure and weigh generously. [That is,] you should give more than the exact quantity as it is said:7Deuteronomy 25: 15. "You must have a full, just measure." What does the word "just" imply? Says the Torah: "Be just by giving him some of your own."8Bava Basra 88b. Rashi explains the apparent redundancy in the phrase “a full just measure” (a full measure is by definition, a just one) stating “although you give a full measure, make it tzedek, just and honest, by adding to it a little of your own; weigh generously, tilt the scale in the customer’s favor.”
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