Related for Berakhot 43:12

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.”

“A man who had a seminal emission (Baal Keri) who does not have water to dip in may read the Shema, but he may not [read it loud enough so that he can] hear [himself talking] with his own ear, and does not say the Beracha (blessing) not before it and not after it.” [These are] the words of Rebbi Meir. And the Chachamim (Sages) say, ”He may read the Shema and he may [read it loud enough so that he can] hear [himself talking] with his own ear, and he says the Beracha [both] before it and after it.” Rebbi Meir said, “One time we were sitting in the Bet Midrash (Study Hall) in front of Rebbi Akiva and we were reading the Shema, but we were not saying it loud enough to be able to hear ourselves, because of one inquisitor who was standing by the door.” They (i.e. Chachamim) said [back] to him, “The time of danger is not a proof.”