Reference for Berakhot 41:1

והרי תפלה דדבר שהצבור עסוקין בו ותנן היה עומד בתפלה ונזכר שהוא בעל קרי לא יפסיק אלא יקצר טעמא דאתחיל הא לא אתחיל לא יתחיל

But Tefillah is also a matter with which the Community is engaged, and there is a Mishnaic teaching: If he was standing in the Tefillah and recollected that he is a Ba'al Keri, he should not interrupt [his prayer] but shorten it. The reason is because he had already commenced it ; hence, if he had not commenced it, he should not do so !

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