Musar for Shabbat 138:1
קמ"ל מיתיבי איזהו שגגת שבועת ביטוי לשעבר שאם אמר יודע אני ששבועה זו אסורה אבל איני יודע אם חייבין עליה קרבן או לא חייב הא מני מונבז היא
hence he [Abaye] informs us [otherwise]. An objection is raised: What is an unwitting offence in respect of an 'oath of utterance' relating to the past?<span class="x" onmousemove="('comment',' I.e., where one falsely swears that he has eaten. ');"><sup>1</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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