Reference for Niddah 50:12

א"ר אדא בר אהבה

Samuel said to Rab Judah: Shinena,<span class="x" onmousemove="('comment',' Keen witted (rt. [H] 'to sharpen'); long-toothed ([H], 'tooth'): or man of iron. ');">¹⁰</span>

Jastrow

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