Reference for Berakhot 31:11

אשתיק א"ל מידי שמיע לך בהא א"ל הכי אמר רב ששת והוא שבטלין ממלאכתן וקורין

[Raba] remained silent ; so he asked him : Hast thou heard anything on this point ? He replied : Thus said Rab Sheshet: [Kawwanah is demanded of workmen] only if they stop their work to read it.

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