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On this date the inauguration period was completed for the Tabernacle, the portable sanctuary that accompanied the Jewish people in the desert following their Exodus from Egypt. On this day, Moses' brother Aaron began serving as the Kohen Gadol (High Priest). Tragically, however, two of Aaron's sons, Nadav and Avihu, died after entering the Holy of Holies unauthorized. The events are recorded in Leviticus chapters 9-10.