Musar for Shabbat 139:5
שמואל סבר לה כרבי יוסי דאמר הבערה ללאו יצאת דתניא הבערה ללאו יצאת דברי רבי יוסי ר' נתן אומר לחלק יצאת
I might think that if one performs all of them in a single state of unawareness,<span class="x" onmousemove="('comment',' Without being informed in between that some of these labours are forbidden, but remaining in ignorance from the first labour to the last. ');"><sup>13</sup></span> he incurs only one [sin-offering]: therefore it is stated, from ploughing and from harvesting thou shalt rest.<span class="x" onmousemove="('comment',' Ibid. XXXIV, 21. Since these are specified individually, it follows that each entails a separate sacrifice. ');"><sup>14</sup></span> Yet I might still argue, For ploughing and for harvesting one incurs two sacrifices, but for all others [together] there is but a single liability: therefore it is stated, 'Ye shall kindle no fire' — Now kindling is included in the general law: why is it singled out? That analogy therewith may be drawn, teaching: just as kindling is a principal labour and it entails a separate liability,<span class="x" onmousemove="('comment',' Since it is stated separately. ');"><sup>15</sup></span>