利未記 23:41 猶太思想：Akeidat Yitzchak

The seven days of consecration which Aaron and his sons spent in isolation, away from their respective families, prior to assuming their priestly functions, were to prepare them spiritually for their task. While they had to remain on the threshold, they were neither to enter the sanctuary nor to leave the holy courtyard. This clearly demonstrated that these seven days were preparatory to their sacred task, but that until the eighth day their preparations would not be complete. Symbolically, these seven days represented the entire life cycle. Just as life on this earth is viewed as an antechamber to the world to come, (Rabbi Yaakov Avot 4,21) so Aaron and sons were to view themselves as dedicating themselves for their lives' destiny. Wherever and whenever we encounter the number seven, it is to remind us that perfection is capable of being achieved at the end of a cycle of seven. Even when we observe a period of mourning, we do so for a seven day period. We have learned this from G'd Himself, who had observed seven days of mourning for mankind when He brought the deluge upon the earth. (Genesis 7,4. see commentary of Rabbi Zeyra in Moed Katan 3,5) He who fails to observe the seven days of preparation, is as if he were already mourning his own demise during the seven days that should have prepared him to attain his goal, his purpose.