Reference for Chullin 257:31

כששימש מעשה עץ שימש

R'Mattenah said: Behold they have spoken of a house roofed with stalks;<span class="x" onmousemove="('comment',' So MS.M. and Rashi. The text in cur. edd. reads: 'If a house was roofed with stalks they become clean'. V. Rashi s.v. .');">¹⁹</span>

Jastrow

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