Reference for Niddah 51:43

חדא היא

What is meant by 'spine'? The ruling which R. Parnak laid down in the name of R. Johanan: The spine of the lulab must be long enough to project a handbreadth above the myrtle.<span class="x" onmousemove="('comment',' With which it is bound to form with the willows the Tabernacles festive wreath (cf. Lev. XXIII, 40). ');">⁴⁰</span>

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