C. F. Keil and Franz Delitzsch on 2 Chronicles 17:5

2Ch 17:5

Therefore Jahve established the kingdom in his hand, i.e., under his rule; cf. 2Ki 14:5. All Judah brought him presents. מנחה, often used of tribute of subject peoples, e.g., in 2Ch 17:11 of the Philistines, cannot here have that signification; nor can it denote the regular imposts of subjects, for these are not called מנחה; but must denote voluntary gifts which his subjects brought him as a token of their reverence and love. The last clause, “and there was to him (he attained) riches and honour in abundance,” which is repeated 2Ch 18:1, recalls 1Ch 29:28; 2Ch 1:12, and signifies that Jehoshaphat, like his ancestors David and Solomon, was blessed for walking in the pious ways of these his forefathers.