Reference for Pesachim 166:3
א"ר יהודה אמר רב כל הגידין בשר חוץ מגידי צואר
Rab Judah said in Rab's name: All sinews are flesh, except the sinews of the neck. We learned: THE BONES, THE SINEWS, AND THE NOTHAR ARE TO BE BURNT ON THE SIXTEENTH.
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