Reference for Shabbat 137:6
בשלמא לרבי יוחנן דאמר כיון ששגג בכרת אע"פ שהזיד בלאו משכחת לה כגון דידע לה לשבת בלאו אלא לר"ש ב"ל דאמר עד שישגוג בלאו ובכרת דידע ליה לשבת במאי דידעה בתחומין ואליבא דר"ע
Now we pondered thereon, Why state the number?<span class="x" onmousemove="('comment',' Since they are enumerated by name. ');"><sup>15</sup></span> And R. Johanan replied: [To teach] that if one performs all of them in a single state of unawareness,<span class="x" onmousemove="('comment',' Of their forbidden nature. ');"><sup>16</sup></span> he is liable [to a sin-offering] for each. Now, how is this possible? [Surely only] where he is aware of the Sabbath but unconscious of [the forbidden nature of] his labours.<span class="x" onmousemove="('comment',' For in the reverse case he incurs only one sin-offering (v. Mishnah 67b). Now awareness of the Sabbath implies that he knows at least one of the labours forbidden, for otherwise the Sabbath is the same to him as any other day, and he cannot be said to be aware thereof. But in the present passage he appears to have known none at all: how then can we regard him as being aware of the Sabbath? This the Talmud proceeds to discuss. ');"><sup>17</sup></span>