2 Chronicles 11:17 - Joseph Benson’s Commentary on the Old and New Testaments

So they strengthened the kingdom of Judah Not only by the addition of so many persons to it, who probably brought what they could of their property with them, but by their piety and prayers they procured a blessing upon the kingdom which was a sanctuary to them, Zechariah 12:5. It is the interest of any nation to protect and encourage religion and religious people, and adds, more than any thing, to its strength. They made him and his people strong three years For so long they walked in the way of David and Solomon Their good way; but when they forsook that, and so threw themselves out of God's favour and protection, the best friends they had could no longer help to strengthen them. This honourable mention of Solomon, as a pattern of piety, is a considerable evidence of his true repentance before his death.