Reference for Zevachim 28:19

ת"ש קבל הכשר ונתן לפסול יחזיר לכשר

It was stated likewise: 'Ulla said in R'Eleazar's name: Carriage by a zar is invalid even according to R'Simeon, It was asked: Is carriage without [moving] the foot<span class="x" onmousemove="('comment',' When the blood is merely transferred by hand.');">¹⁴</span>

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