Reference for Menachot 54:8

ור' יהודה סבר אל הקודש ומבית לפרכת בלא יבא ואל פני הכפרת בלא ימות

he has thereby incurred death [at the hands of heaven]. R'Judah says, If he entered into the Temple or within the veil he has thereby incurred forty [stripes], and if he entered towards the front of the mercy-seat he has thereby incurred death.

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