And in the twentieth year of Jeroboam king of Israel reigned Asa over Judah.
In the twentieth year of Jeroboam ... reigned Asa over Judah. This appears at variance with the statement in 1 Kings 15:1-2, that Abijam became king of Judah in the eighteenth year of Jeroboam, and that he reigned three years in Jerusalem. But Abijam's reign may not have begun in the 18th year of Jeroboam; and if his death took place in the 20th yar, the duration of his reign would, according to the Hebrew mode of computation, be three years.