Reference for Bava Metzia 178:2

התם משום ביטול מלאכה כי קא מיבעיא לן היכא דאיכא אשתו ובניו מאי

What is the ruling? — Come and hear: Labourers may eat the top most grapes of the [vine-] rows,<span class="x" onmousemove="('comment',' They may conserve their appetite till they reach these, which being more exposed to the sun than the lower ones, are sweeter (Rashi). ');">²</span>

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