Reference for Yoma 38:13

ואומרים לו אישי כ"ג הפג אחת על הרצפה וכו' אמר רב יצחק על חדת מאי היא אמרי ליה אחוי קידה

AND THEY WOULD SAY: SIR HIGH PRIEST, ARISE AND DRIVE THE SLEEP AWAY THIS ONCE. R'Isaac said: [Show us] something new.<span class="x" onmousemove="('comment',' lit., 'for something new explaining 'this once' in the MISHNAH:');">²³</span> What was that? - They said to him: Show us the kidah.<span class="x" onmousemove="('comment',' Pressing both big toes against the floor, bowing and kissing the pavement, and rising without moving the feet - this difficult performance was called the kidah-the bowing to the ground.');">²⁴</span>

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