עקידת יצחק — אל יבא בכל עת אל הקדש / בזאת יבא אהרן אל הקדש

Q — Why are the Yom Kippur avodah laws introduced by the death of Aharon's sons? Why "אל יבא בכל עת" — entry to the Kodesh restricted to one day, one order? Why "בזאת" — only thus?

A — The sons' death frames the law to teach that approach to the holiest place must have boundary and order, not free access at any time. Nadav and Avihu drew near without command; the response is not to forbid nearness but to channel it — "בזאת," only in this prescribed manner, on this day, through this avodah. Holiness is most safely and truly served through measured, commanded approach; the gravest danger to kedushah is unbounded zeal, and the Kohen Gadol's entry models reverent limit.