Commentary for Yoma 137:5

וכי תימא כלאים בלבישה והעלאה הוא דאסור בהצעה שרי והתניא (ויקרא יט, יט) לא יעלה עליך אבל אתה מותר להציעו תחתיך אבל אמרו חכמים אסור לעשות כן שמא תיכרך נימא אחת על בשרו

And if you were to say: Something was placed in between, but did not R'Simeon B'Pazzi in the name of R'Joshua B'Levi say on the authority of Rabbi, in the name of the Holy Community of Jerusalem: Even if there were ten mattress covers, one on top of the other, with mixed textures under them, it would still be forbidden to sleep on them. Rather, therefore, must you say [the meaning is]: 'Next to their heads'.

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