Talmud for Yevamot 1:5

Since Rebbi Simeon ben Laqish has this objection, from where does Rebbi Simeon derive it³³The rule that the High Priest is separated from his family for seven days before the Day of Atonement.? Following that of Rebbi Ismael:³⁴Babli 4a. With this Aaron shall come into the Sanctuary³⁵Lev. 16:3., what was said in the matter³⁶Of Aaron’s induction into the High Priesthood.. One separates him all of seven days, he serves all of seven days, and one initiates him all of seven days. Also in this case one separates him all of seven days, he serves all of seven days, and one initiates him all of seven days. Is that spelled out in the matter? But since the death of Aaron’s sons is mentioned in the matter³⁷Lev. 16:1. and they died during the initiation, it is as if the matter was mentioned. Does not in the end Rebbi Simeon ben Laqish understand it from the same verse³⁸He still has to explain the same verse used by R. Joḥanan and Bar Qappara, which he himself proved to be inadequate.? But he is like a person who hears a statement and questions it. Rebbi Yose ben Rebbi Abun said, the reason of Rebbi Simeon ben Laqish is: the glory of the Eternal was dwelling on Mount Sinai³⁹Ex. 24:16.. Just as Moses did not enter the Holiest of Holies before he was sanctified in the cloud all of seven days, so Aaron did not enter the Holiest of Holies before he was inducted by the anointing oil all of seven days⁴⁰It is not a biblical requirement but popular usage supported by an aggadic argument..