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What connection did Aaron have with the first Passover ordinance?

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Aaron Aaron, detail of a 3rd-century fresco from the synagogue at Doura-Europus, Syria; in the National Museum, Damascus

According to the Book of Exodus, God entrusted the ordinance of Passover to both Aaron and Moses.1

Prior to the final plague—the death of the firstborn—God instructed both brothers to direct the Israelites to sacrifice a lamb and mark their doorposts with its blood so that the Lord would pass over their homes. In these same instructions, God established the festival as a perpetual ordinance to be observed throughout all generations, including the requirement to eat unleavened bread.1