Related for Berakhot 44:5
אמר רבא הלכתא בריא המרגיל וחולה המרגיל ארבעים סאה ובריא לאונסו תשעה קבין אבל לחולה לאונסו פטור מכלום:
Raba said : The Halakah is — Both the healthy man and the delicate person when it is voluntary require forty Saot ; the healthy man when it is involuntary requires nine Kabs; but the delicate person when it is involuntary is exempt therefrom altogether.
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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