Reference for Pesachim 91:1

לענין צירוף טומאה בפסח ובשאר ימות השנה איכא פלוגתא

IN RESPECT TO combining for UNCLEANNESS on Passover, whereas during the rest of the year there is a distinction. How is that? E.g. , if there are eatables less than an egg in quantity,<span class="x" onmousemove="('comment',' This being the minimum standard which can defile.');">¹</span>

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