Nadab (nâ'dăb). spontaneous, liberal. 1. The eldest son of Aaron. Exodus 6:28, Exodus 24:1, Exodus 24:9, Exodus 28:1, Leviticus 10:1, Numbers 3:2, Numbers 3:4, Numbers 1:26-61, 1 Chronicles 6:3, 1 Chronicles 24:1, 1 Chronicles 2:2. The son and successor of Jeroboam I., king of Israel, whose sinful conduct he imitated. He reigned two years, 954-953 b.c., and while engaged at the siege of Gibbethon he and all his house were slain by Baasha. 1 Kings 14:20, 1 Kings 1:15-31.. One of Judah's posterity. 1 Chronicles 2:28, 1 Chronicles 2:30.. A Benjamite, one of the family from which Saul descended. 1 Chronicles 8:30, 1 Chronicles 9:36.