Maaseh Rav Siman 36
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
צואת האף והאוזן לא מקרי צואה לענין ק"ש ותפלה דאי סלקא דעתך דמיקרי צואה היה צריך להרחיק ד' אמות:
Sefaria Community Translation
Release from the nostril or the ear is not considered a "release" concerning the recitation of 'Keriat Shema' and prayer, for if you would think that it was considered a "release" you would need to distance yourself four Amos: