Reference for Bava Batra 177:15

ושל חנווני ושל בעה"ב תלויה באויר טפח וגבוהה מן הארץ טפח וקנה ומתנא שלה ששה טפחים ושל טורטני תלויה באויר שלש אצבעות וגבוהה מן הארץ שלש אצבעות וקנה ומתנא שלה איני יודע

Our Rabbis taught: If one asked him for a pound,<span class="x" onmousemove="('comment',' V. Glos. ');">²¹</span> a pound must be weighed. [If] half a pound, half a pound must be weighed. A quarter of a pound, a quarter of a pound must be weighed. What does this teach us? — That weights must be provided in these [three] denominations.<span class="x" onmousemove="('comment',' These denominations are essential. Any other weights have to be computed from these. ');">²²</span>

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