ELISHEBA (ē-lĭsh'ēba). Amminadab’s daughter, sister of Nahshon, captain of Judah (Num.2.3). By marrying Aaron (Exod.6.23) she connected the royal and priestly tribes.
ELISHEBA ĭ lĭsh’ ə bə (אֱלִישֶׁ֧בַע, God is an oath). Daughter of Amminadab; sister of Nahshon; the wife of Aaron; mother of Nadab, Abihu, Eleazar, and Ithamar (Exod 6:23). Since Nahshon was the leader of Judah (Num 1:7; 2:3), Elisheba was of that tribe. Her son Eleazar succeeded Aaron as chief priest (Num 20:25-28).
International Standard Bible Encyclopedia (1915)
(’elishebha`, "God swears," "God is an oath"):
Daughter of Amminadab, sister of Nashon, wife of Aaron, mother of Nadab, Abihu, Eleazar and Ithamar, the foundress, therefore, of the entire Levitical priesthood (Ex 6:23).