Exodus 6:23-30 YLT

23 And Aaron taketh Elisheba daughter of Amminadab, sister of Naashon, to himself for a wife, and she beareth to him Nadab, and Abihu, Eleazar, and Ithamar.
24 And sons of Korah [are] Assir, and Elkanah, and Abiasaph: these [are] families of the Korhite.
25 And Eleazar, Aaron's son, hath taken to him [one] of the daughters of Putiel for a wife to himself, and she beareth to him Phinehas: these [are] heads of the fathers of the Levites, as to their families.
26 This [is] Aaron -- and Moses -- to whom Jehovah said, `Bring ye out the sons of Israel from the land of Egypt, by their hosts;'
27 these are they who are speaking unto Pharaoh king of Egypt, to bring out the sons of Israel from Egypt, this [is] Moses -- and Aaron.
28 And it cometh to pass in the day of Jehovah's speaking unto Moses in the land of Egypt,
29 that Jehovah speaketh unto Moses, saying, `I [am] Jehovah, speak unto Pharaoh king of Egypt all that I am speaking unto thee.'
30 And Moses saith before Jehovah, `Lo, I [am] of uncircumcised lips, and how doth Pharaoh hearken unto me?'