If one recited Shema too early, before the zman (i.e. after dawn, but before Mi’Sheyakir) even if one was not an ‘Oness” (i.e. one did not have cause to say it earlier than the zman, one need not repeat Shema, and one was yotze the mitzvah bidieved. Shulchan Aruch w/Mishnah Berurah 58:4
However, one may not use this heter regularly (e.g. according the Mishnah Berurah, more than once a month). If one regularly says Shema before the zman one is not yotze, even Bidieved, unless one has no other possibility in fulfilling the mitzvah properly. Shulchan Aruch w/Mishnah Berurah 58:4
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