1 Kings 11:28

And the man Jeroboam was a mighty man of valor, an energetic, capable man; and Solomon seeing the young man that he was industrious, he did his work well, he accomplished what he set out to do, he made him ruler over all the charge of the house of Joseph, the overseer of the levy of men out of the tribe of Ephraim, It is probable that the use of men of Ephraim for this work nourished the spirit of rebellion which Jeroboam afterwards used for his benefit.