Reference for Chullin 246:2

א"ל רב יוסף

- R'Joseph replied to him: As for your objection 'people might say that immersion during the day is sufficient', [my answer is,] the tearing explains the position;<span class="x" onmousemove="('comment',' The onlookers will know that it is the tearing of the garment that renders it clean and not the immersion by itself.');">²</span>

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