Musar for Berakhot 41:7
אמר רב יהודה ספק קרא קריאת שמע ספק לא קרא אינו חוזר וקורא ספק אמר אמת ויציב ספק לא אמר חוזר ואומר אמת ויציב מאי טעמא קריאת שמע דרבנן אמת ויציב דאורייתא
Rab Judah said : If one is in doubt whether he has read the Shema' or not, he does not repeat it ; if he is in doubt whether he said "True and firm" or not, he does repeat it. What is the reason ? Because the reading of the Shema' is ordained by the Rabbis, but saying "True and firm" by the Torah.
Shenei Luchot HaBerit
In some instances one scholar may see as many as three distinct negative commandments involving the consumption of חמץ, leavened things, whereas another scholar considers that there is only a single culpability for all of these prohibitions of חמץ, be it before Passover, during Passover, or after Passover. Even such universally known precepts as the recital of קריאת שמע, are subject to debate, one Rabbi claiming it is a Biblical precept, another saying that it is merely a Rabbinic injunction.
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