Exodus 6:23-25

American Standard Version

²³ And Aaron took him Elisheba, the daughter of Amminadab, the sister of Nahshon, to wife; and she bare him Nadab and Abihu, Eleazar and Ithamar. ²⁴ And the sons of Korah: Assir, and Elkanah, and Abiasaph; these are the families of the Korahites. ²⁵ And Eleazar Aaron’s son took him one of the daughters of Putiel to wife; and she bare him Phinehas. These are the heads of the fathers’ houses of the Levites according to their families.