Jamieson, Fausset and Brown on 1 Kings 12:20-24

20-24. when all Israel heard that Jeroboam was come again--This verse closes the parenthetical narrative begun at 1Ki 12:2, and 1Ki 12:21-24 resume the history from 1Ki 12:1. Rehoboam determined to assert his authority by leading a large force into the disaffected provinces. But the revolt of the ten tribes was completed when the prophet Shemaiah ordered, in the Lord's name, an abandonment of any hostile measures against the revolutionists. The army, overawed by the divine prohibition, dispersed, and the king was obliged to submit.