Reference for Bava Metzia 221:4

אמר רבה בר רב הונא הני שוקאי דסורא לא עברי משום בל תלין מידע ידעי דעל יומא דשוקא סמיכי אבל משום בל תשהא ודאי עובר:

We learnt: IF ENGAGED BY THE HOUR, HE CAN COLLECT IT ALL DAY AND NIGHT, this refutes Rab!<span class="x" onmousemove="('comment',' For Samuel can say that it applies to a night worker, but on Rab's view it can apply to ');">⁵</span> — Rab can answer you: It is meant disjunctively. [Thus:] If engaged by the hour for day work, he can collect his wages all day; for night work, he can collect it all night.

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