Exodus 6:23-30 CJB

23 Aharon married Elisheva daughter of 'Amminadav and sister of Nachshon, and she bore him Nadav, Avihu, El'azar and Itamar.
24 The sons of Korach were Asir, Elkanah and Avi'asaf. These were the Korchi families.
25 El'azar the son of Aharon married one of the daughters of Puti'el, and she bore him Pinchas. These were the heads of the families of Levi, family by family.
26 These are the Aharon and Moshe to whom ADONAI said, "Bring the people of Isra'el out of the land of Egypt, division by division,"
27 and who told Pharaoh king of Egypt, to let the people of Isra'el leave Egypt. These are the same Moshe and Aharon.
28 On the day when ADONAI spoke to Moshe in the land of Egypt,
29 he said, "I am ADONAI. Tell Pharaoh, king of Egypt, everything I say to you."
30 Moshe answered ADONAI, "Look, I'm such a poor speaker that Pharaoh won't listen to me."