Pesachim, Chapter 8, Mishnah 7. The Mishnah opens with a dispute among the Tannaim regarding the number of people who may be registered for the korban Pesach, and continues with the laws of the composition of the groups.
"Ein shochatin es haPesach al hayachid" - the Pesach offering is not slaughtered for a single individual:
The words of Rabbi Yehudah: It is forbidden to slaughter a korban Pesach for a single individual, since there is a concern that he will not be able to eat the entire offering, and by the very nature of the matter the meat will be left over as nosar.
Rabbi Yosei permits it: As long as the individual is capable of eating the entire offering, it is permitted. Even though it is possible that he will not actually manage to do so, it is enough that he has the capacity to eat it.
"Va'afilu chaburah shel me'ah she'ein yachol le'echol kazayis" - and even a group of a hundred among whom there is one who cannot eat a kazayis:
This is a continuation of Rabbi Yosei's position: even if a group of a hundred people is registered, and among them are those who cannot eat a kazayis - "ein shochatin aleihen" - the offering is not slaughtered for them. Every person for whom the Pesach is slaughtered must be capable of eating at least a kazayis of it.
"Ve'ein osin chaburas nashim va'avadim uketanim" - a group is not formed of women, slaves and minors:
One may not combine a group made up of women, slaves and minors and slaughter the korban Pesach for them. The Gemara spells out the details:
A group of women and slaves together, or of slaves and minors together: This is forbidden because of immodest behavior, since such an arrangement is not consistent with modesty.
A group made up entirely of women or entirely of slaves: This is permitted, since they are all obligated in the korban Pesach. If the women wish to be registered as a group of their own, they may do so, and the same applies to slaves.
A group made up entirely of minors: This is not done, since they are not of full understanding and have not reached the level of comprehension that carries obligation in mitzvos. Even though we obligate them by virtue of chinuch, a group of minors is not formed for the korban Pesach.
In summary: In this Mishnah we learned the dispute between Rabbi Yehudah and Rabbi Yosei concerning slaughtering the Pesach for an individual, the rule that it is not slaughtered for someone who cannot eat a kazayis - even within a group of a hundred - and the laws of the composition of the group: women and slaves, or slaves and minors, are not combined because of immodest behavior, and a group of minors is not formed because they are not of full understanding, but a group made up entirely of women or entirely of slaves is valid, since they are all obligated in the korban Pesach.