Reference for Chullin 116:6

חזיתיה לבר מחוזא דסחא במיא וסליק ואיכרך בסדינין ואותיבת עליה ומצת מיניה ולא הודעת לי

Said she to him, "I was once watching a resident of Mahza bathing in the sea, and when he came out and wrapped himself in a sheet you came and settled down on him and sucked his blood, but you did not tell me of it"'.

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