Charles Ellicott Commentary 1 Kings 14:28

"And it was so, that, as oft as the king went into the house of Jehovah, the guard bare them, and brought them back into the guard-chamber." — 1 Kings 14:28 (ASV)

When the king went. —Therefore we see that Rehoboam still worshipped in the house of the Lord. If his idolatry were like that of his father, it would not have prevented this; but in 2 Chronicles 12:6–8; 2 Chronicles 12:12 it is implied that after the invasion he humbled himself, and returned to the Lord.