Pesachim 69B

וכל שאילו ביחיד נדחה, בציבור עבדי בטומאה. וכל מילתא דאיתא בציבור, איתא ביחיד. וכל מילתא דליתא בציבור, ליתא ביחיד.

And R' Eliezer further maintains with regard to any form of impurity due to which an individual is deferred to the second Pesaḥ, that if the entire community is afflicted with it, they observe the first Pesaḥ in a state of ritual impurity. And he accepts yet another principle: Anything that applies to the community applies to an individual, and anything that does not apply to the community does not apply to an individual.

ערילות, דאי כוליה ציבור ערלים נינהו, אמרינן להו: קומו מהולו נפשייכו ועבידי פסחא. יחיד נמי, אמרינן ליה: קום מהול ועביד פסחא. ואי לא מהיל ועביד ⁠— ענוש כרת.

On the basis of these principles, we can say as follows: With regard to lack of circumcision, if the entire community is uncircumcised we say to them: Arise, and circumcise yourselves, and offer the Paschal lamb, and we do not allow them to offer the sacrifice while uncircumcised. Therefore, with regard to an individual as well, we say to him: Arise, and circumcise yourself, and offer the Paschal lamb; and if he does not circumcise himself and offer the Paschal lamb, he is liable to the punishment of karet.

טומאה, דאי כוליה ציבורא טמאין נינהו ⁠— לא מדינן עלייהו, אלא עבדי בטומאה, יחיד נמי פטור.

With regard to impurity, however, if the whole community is impure we do not sprinkle the purifying water on them; rather, they offer the Paschal lamb in a state of ritual impurity. Therefore, an individual, as well, is exempt from sprinkling; and since he is exempt, sprinkling does not override Shabbat. A distinction may be drawn between the two cases: An uncircumcised person must circumcise himself, but a person who is ritually impure need not undergo purification.

אמר ליה רב הונא בריה דרב יהושע לרבא: והרי פסח שני, דליתיה בציבור ואיתיה ביחיד! אמר ליה: שאני התם דהא עבד ליה ציבורא בראשון.

Rav Huna, son of Rav Yehoshua, said to Rava: Are these principles really correct? But there is the second Pesaḥ, which does not apply to the community and yet it applies to an individual. Rava said to Rav Huna: It is different there, as the community already offered the Paschal lamb on the first Pesaḥ in a state of ritual impurity, and therefore the second Pesaḥ can apply to individuals although it does not apply to the community.