Reference 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. ');">⁴</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. ');">⁵</span> [ONE MUST] NOT HEAP [IT UP]. [IF THE USAGE IS] TO HEAP [IT UP], ONE MUST NOT STRIKE IT.

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