14 God incited Hadad, a descendant of the king of Edom, into hostile actions against Solomon. 15 Years earlier, when David devastated Edom, Joab, commander of the army, on his way to bury the dead, massacred all the men of Edom. 16 Joab and his army stayed there for six months, making sure they had killed every man in Edom.
Matthew Henry's Commentary on 1 Kings 11:14-16
Commentary on 1 Kings 11:14-25
(Read 1 Kings 11:14-25)
While Solomon kept close to God and to his duty, there was no enemy to give him uneasiness; but here we have an account of two. If against us, he can make us fear even the least, and the very grasshopper shall be a burden. Though they were moved by principles of ambition or revenge, God used them to correct Solomon.