Numbers 3:14

New King James Version

Then the Lord spoke to Moses in the Wilderness of Sinai, saying:

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In the third month after the children of Israel had gone out of the land of Egypt, on the same day, they came to the Wilderness of Sinai.

But the Levites were not numbered among them by their fathers’ tribe;

The sons of Levi were Gershon, Kohath, and Merari.