Reference for Menachot 12:23

הדר אמר ר"נ לעולם עבודה היא ולא גמרה עבודתה עד דעביד לה מתן כלי

R'Nahman demurred: What is the view of those Tannaim? If they hold that the taking of the handful by persons unfit is regarded as a service, [then it should be invalid] even though it had not been put into a vessel?<span class="x" onmousemove="('comment',' For it has already been rendered invalid by the service performed by the unfit person, and this can in no wise be remedied.');">³⁰</span>

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