משנה אויף ויקרא 24:9

If he slaughtered the two lambs [intending] to eat one of the [two] loaves the next day, or if he burned the two dishes [of the frankincense intending] to eat one of the [two] rows of the showbread the next day: Rabbi Yose says: that loaf or that row about which he expressed the intention is piggul and he is liable for karet for it, while the other is invalid but he is not liable for karet for it. But the sages say, both are piggul and he is liable for karet for both of them. If one of the [two] loaves or one of the [two] rows [of the showbread] became unclean: Rabbi Judah says: both must be taken out to the place of burning, for the offering of the congregation may not be divided. But the sages say, the unclean [is treated] as unclean, but the clean may be eaten.