Taanit 10B

ובימים טובים הכתובין במגילת תענית.

and for commemorative holidays that are written in Megillat Ta’anit, which contains a list of dates on which the rabbis prohibited fasting.

תנו רבנן: אל יאמר אדם תלמיד אני, איני ראוי להיות יחיד, אלא: כל תלמידי חכמים יחידים. איזהו יחיד ואיזהו תלמיד? יחיד ⁠— כל שראוי למנותו פרנס על הצבור, תלמיד ⁠— כל ששואלין אותו דבר הלכה בתלמודו ואומר, ואפילו במסכתא דכלה.

A baraita states: A person should not say: I am only a student, and consequently I am unworthy to be considered an individual who fasts, as stated in the Mishnah. Rather, with regard to the fasts of individuals, all Torah scholars are individuals. The baraita elaborates: Who is an individual and who is a student? An individual is anyone who is learned in Torah and worthy to be appointed leader and teacher over the community. A student is any Torah scholar who is asked a matter of halakha in his studies and he says the correct answer, and this is the case even if he is familiar only with the tractate of the kalla month, i.e., the tractate the community studied that year.

תנו רבנן: לא כל הרוצה לעשות עצמו יחיד עושה, תלמיד ⁠— עושה, דברי רבי מאיר. רבי יוסי אומר: עושה, וזכור לטוב, לפי שאין שבח הוא לו, אלא צער הוא לו.

A baraita states in another baraita: Not everyone who wishes to make himself an individual and conduct himself accordingly may do so, and nor may everyone who wants to act like a student do so. This is the statement of R' Meir. R' Yosei says: One may do so, and he is even remembered for good, as the conduct of a Torah student is not a source of praise for him, but it is a source of pain for him. It is proper for one to take these obligations upon himself and he is not considered to be acting inappropriately.

תניא אידך: לא כל הרוצה לעשות עצמו יחיד עושה, תלמיד ⁠— עושה, דברי רבי שמעון בן אלעזר. רבן שמעון בן גמליאל אומר: במה דברים אמורים: בדבר של שבח, אבל בדבר של צער ⁠— עושה, וזכור לטוב, שאין שבח הוא לו, אלא צער הוא לו.

It is taught in another baraita: Not everyone who wishes to make himself an individual may do so, and nor may everyone who wishes to act like a student do so. This is the statement of R' Shimon ben Elazar. Rabban Shimon ben Gamliel says: In what case is this statement said? It is said with regard to a matter of praise, e.g., adorning oneself with the garments of a Torah scholar. However, with regard to a matter of pain, when Torah scholars act strictly, one may do so, and one who acts strictly is remembered for good, as it is not a source of praise for him, but it is a source of pain for him.