John Gill Commentary 2 Chronicles 17:5

"Therefore Jehovah established the kingdom in his hand; and all Judah brought to Jehoshaphat tribute; and he had riches and honor in abundance." — 2 Chronicles 17:5 (ASV)

Therefore the Lord stablished the kingdom in his hand
Piety is the best prop of government; the throne is best supported and established by truth, righteousness, and mercy; by the exercise of these Jehoshaphat was settled in his kingdom, and had a place in the hearts of his people:

and all Judah brought to Jehoshaphat presents ;
being well affected to him, as well as it was usual so to do at a prince's accession to the throne, see (1 Samuel 10:27)

and he had riches and honour in abundance ;
through the presents his subjects brought him, and the respect they showed him.