Tosefta for Zevachim 149:1
איתיביה אביי קרבן יחיד שנתערב בקרבן יחיד וקרבן ציבור שנתערב בקרבן ציבור וקרבן יחיד וקרבן ציבור שנתערבו זה בזה נותן ד' מתנות מכל אחד ואחד ואם נתן מתנה מכל אחד יצא ואם נתן ארבע מכולן יצא
<br> Abaye raised an objection to him: If an individual's sacrifice was mixed up with an individual's sacrifice, or a congregational sacrifice with a congregational sacrifice, or if an individual's sacrifice and a congregational sacrifice were mixed up, [the priest] must make four applications [of the blood] of each [sacrifice]; Yet if he made an application of each, he has fulfilled his obligation; and if he made four applications from all, it suffices. When is this said? If they were mixed up alive; but if they were mixed up after being slaughtered, he makes four applications for all of them; yet if he made one application, he fulfilled his duty. Rabbi said: We examine the application: if it contains sufficient for each, it is fit; if not, it is unfit. Now, he teaches about an individual who is similar to the congregation: as the congregation [consists of] men, so the individual [means] a man! - Said Raba: And is it reasonable that this is correct [as it stands]? [Surely not,] for he teaches: When is this said? if they were mixed up alive; but not if they were mixed up when slaughtered. But what does it matter whether they are alive or slaughtered? Rather, this is what he means: when is this said? If they were mixed up, when slaughtered, as if they were alive, [viz.,] the goblets [were mixed up]; but where one mingled [the blood in one goblet], [the priest] makes four applications for all of them; yet if he made one application on behalf of all, he has fulfilled his duty. <br>