Reference for Taanit 60:9

אלא ט"ו באב מאי היא אמר רב יהודה אמר שמואל יום שהותרו שבטים לבוא זה בזה

As it has been taught: When the Rabbis said that a man should turn over the bed, they meant not only his own bed but also all the beds [in the house]. Raba said: The halachah is according to our Tanna, but the Sages would not accept his [R'Judah's] view at all.

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