Related for Berakhot 44:6
ת"ר בעל קרי שנתנו עליו ט' קבין מים טהור בד"א לעצמו אבל לאחרים ארבעים סאה ר' יהודה אומר מ' סאה מכל מקום
Our Rabbis have taught: A Ba'al Keri upon whom nine Kabs of water have been poured becomes clean. Of what does this speak ? [If he wishes to study Torah] for himself; but [if he wishes to teach it] to others, forty Saot are necessary. R. Judah says that in every case forty Saot [are required].
Tosefta Berakhot
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."
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