Exodus 24:9

Then Yahweh said to him, “Go down and come up again, you and Aaron with you; but do not let the priests and the people break through to come up to Yahweh, lest He break out against them.”

“Now as for you, bring near to yourself Aaron your brother, and his sons with him, from among the sons of Israel, to minister as priests to Me—Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.

Then Nadab and Abihu, the sons of Aaron, took their respective firepans and put fire in them. Then they placed incense on it and offered strange fire before Yahweh, which He had not commanded them.

Yahweh therefore said to Moses, “Gather for Me seventy men from the elders of Israel, whom you know to be the elders of the people and their officers, and take them to the tent of meeting, and let them take their stand there with you.

“As for the prince, he shall sit in it as prince to eat bread before Yahweh; he shall enter by way of the porch of the gate and shall go out by the same way.”

For when every commandment had been spoken by Moses to all the people according to the Law, he took the blood of the calves and the goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people,