Musar for Shabbat 138:2
(לישנא אחרינא מני אילימא מונבז פשיטא השתא בכל התורה דלאו חידוש הוא אמר שגגת קרבן שמה שגגה הכא דחידוש הוא לא כ"ש אלא לאו רבנן היא ותיובתא דאביי תיובתא):
Where one says, 'I know that this oath is forbidden,<span class="x" onmousemove="('comment',' Knowing that he is swearing to an untruth. ');"><sup>2</sup></span> but I do not know whether it entails a sacrifice or not,' he is culpable?<span class="x" onmousemove="('comment',' This contradicts Abaye. ');"><sup>3</sup></span>
Shenei Luchot HaBerit
The latter two questions may be adequately answered by the halachic ruling in Shabbat 69 that a person who is lost in the desert and has lost track of time should observe six days of work and rest on the seventh day, starting his count from the moment he does not remember which day of the week it is. The reasons for this ruling are explained by Kley Chemdah on פרשת כי תשא.
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