Reference for Pesachim 109:10

והאיכא ליליא אמר רב ששת כב"ש רב אשי אמר לעולם כב"ה לפי שאין דרכן של בני אדם לנכש בלילה

<big><b>GEMARA: </b></big>At first he [the Tanna] teaches custom,<span class="x" onmousemove="('comment',' The preceding Mishnah regards abstention from work a mere custom and in this Mishnah it is treated as a prohibition!');">⁸</span> and then he teaches a prohibition? - Said R'Johanan, There is no difficulty: one is according to R'Meir; the other, according to R'Judah.

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