Responsa for Shabbat 138:8
היודע עיקר שבת: מנהני מילי אמר רב נחמן אמר רבה בר אבוה תרי קראי כתיבי (שמות לא, טז) ושמרו בני ישראל את השבת וכתי' (ויקרא יט, ג) ואת שבתותי תשמורו הא כיצד ושמרו בני ישראל את השבת שמירה אחת לשבתות הרבה ואת שבתותי תשמורו שמירה אחת לכל שבת ושבת
An objection is raised: If one is travelling on a road and does not know when it is the Sabbath, he must observe one day for six. — Surely that means that he counts six days and observes one? No: he keeps one day and counts six. If so, [instead of] 'he must observe one day for six,' he should state, 'he must observe one day and count six'? Moreover, it was taught: If one is travelling on a road or in a wilderness and does not know when it is the Sabbath, he must count six and observe one day.' This refutation of Hiyya b. Rab is indeed a refutation. Raba said: Every day he does sufficient for his requirements [only],<span class="x" onmousemove="('comment',' But no unnecessary work, since each day may be the Sabbath. ');"><sup>14</sup></span>
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