Reference for Shabbat 278:17

אמר רב פפא לא ניהדק איניש צינייתא בפומיה דכוזני דחביתא משום דמיחזי כמשמרת

He also went and dozed in a ferry and thus crossed to the other side and looked after his fruit, asserting, 'My intention was to sleep.' Said he to them, You speak of an artifice: it is an artifice [in connection with] a Rabbinical [interdict].<span class="x" onmousemove="('comment',' For even if he did these without an artifice he would only violate a Rabbinical, not a Scriptural interdict. ');">¹⁵</span>

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