Shulchan Arukh, Orach Chayim Siman 49
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.
שיכול לומר ק"ש בעל פה. ובו סעיף אחד
אע"ג דקיימא לן דברים שבכתב אי אתה רשאי לאומרם על פה כל דבר שרגיל ושגור בפי הכל כגון ק"ש וברכת כהנים ופרשת התמיד וכיוצא בהן מותר:
Mishna Berura Yomi
Even though we have established that things [from the Torah] which were written, you have no permission to recite them by heart, any thing that is routine and fluent in everyone's mouth, for example, the recitation of the Sh'ma and the Priestly Blessing and the section of the daily offering, and similar things to them is permitted.