Adam Clarke on 1 Kings 12:24

For this thing is from me - That is, the separation of the ten tribes from the house of David.

They - returned to depart - This was great deference, both in Rehoboam and his officers, to relinquish, at the demand of the prophet, a war which they thought they had good grounds to undertake. The remnant of the people heard the Divine command gratefully, for the mass of mankind are averse from war. No nations would ever rise up against each other, were they not instigated to it or compelled by the rulers.