Reference for Zevachim 80:1

אמין שבאצבע בדם שיהא בדם שיעור טבילה מעיקרא וטבל ולא מספג

<br> if there is a wart on the finger it is fit. 'In the blood' [teaches] that there must be sufficient blood for dipping at the outset. 'And he shall dip' [teaches] but not sponge up. Now it is necessary to write both 'and he shall dip' and 'in the blood'. For if the Divine Law wrote, 'and he shall dip' [only], I would say, even where there is insufficient for dipping in the first place; therefore the Divine Law wrote, 'in the blood'. And if the Divine Law wrote 'in the blood' [only], I would say [that] he may even sponge it up; therefore the Divine Law wrote, 'and he shall dip'.

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