Look at the Rabbenu Yonah on Brochos whether on who follows R’ Gamliel by Krias Shma, a small sukkah whether he is yotzei. Can the chazal take away a biblical mitzva? The Mishneh Lamelech (Rambam Hilchas Trumas 7:1) questions if a kohen is impure with a tuma derabonon and eats Truma is he chayev misoh?
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