Related על ברכות 3:6

A man who had a seminal emission (Baal Keri) and is sick, if nine Kavs of water were poured on him, he may read [the Shema]. But he may not fulfill the obligation [of reading the Shema] for others until he dips himself in forty Seah [of water]. Rebbi Yehudah says, “Forty Seah no matter what."

Zavim, Zavot, Niddot, and women who gave birth are permitted to read the Torah and to learn Mishna, Midrash, laws, and Aggadot. And men who had a seminal emission (Baalei Keraim) are forbidden in all of them. Rebbi Yossi says, “He can learn the laws that he is familiar with, as long as he does not arrange the Mishna.”