Reference for Menachot 14:17

לא עד שלא יצתה מידו הזאה טעון כיבוס ומשיצאה הזאה מידו ונתזה ממה שנשאר אין טעון כיבוס

I might have said that [it was valid] even though [the priest] had not received at the very beginning sufficient blood [in the one vessel] for dipping; it therefore stated, 'In the blood'. And had the Divine Law only stated, 'In the blood', I might have said that he may even wipe up [the blood]; it therefore stated, 'And he shall dip'.'

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