Aaron: Summoned to Sinai with Nadab, Abihu, and Seventy Elders
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Exodus 19:24
And the LORD replied, “Go down and bring Aaron with you. But the priests and the people must not break through to come up to the LORD, or He will break out against them.”
Exodus 24:1, 9, 10
Then the LORD said to Moses, “Come up to the LORD—you and Aaron, Nadab and Abihu, and seventy of Israel’s elders—and you are to worship at a distance. / Then Moses went up with Aaron, Nadab and Abihu, and seventy of the elders of Israel, / and they saw the God of Israel. Under His feet was a work like a pavement made of sapphire, as clear as the sky itself.