Commentary for Shabbat 4:4

מאי שנא הכא דתני ב' שהן ד' בפנים וב' שהן ארבע בחוץ ומאי שנא התם דתני שתים שהן ארבע ותו לא

Now, why is it taught here, TWO WHICH ARE FOUR WITHIN, AND TWO WHICH ARE FOUR WITHOUT; whereas there it is [simply] stated, 'two which are four,' and nothing else? — Here, since the Sabbath is the main theme, [both] principal [forms of labour] and derivatives are taught;<span class="x" onmousemove="('comment',' Labours forbidden on the Sabbath are of two classes: (i) principal labours (aboth, lit., 'fathers') and (ii) derivatives (toledoth, lit., 'offsprings'), which are prohibited as partaking of the nature of the principal labours. Both are regarded as Biblical. Carrying out from private into public ground is a principal labour, while the reverse is a derivative thereof (infra 96b). ');">⁴</span>

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