Wealth and riches shall be in his house - The Septuagint and the Vulgate render this, "glory and riches shall be in his house." The word, however, properly means riches or wealth, and the two terms are used apparently to convey the idea that wealth or property in "varied forms" would be in his house; that is, not merely gold and silver, but all that was understood to constitute wealth - variety of garments, articles of furniture, etc. This promise is of the same nature as that of the previous verse. It pertains to a general truth in regard to the influence of religion in promoting prosperity. Compare the notes at 1 Timothy 4:8.

And his righteousness endureth for ever - That is, The effects of it shall be transmitted from age to age in the prosperity, the respectability, the wealth, the happiness of his descendants. It travels on from age to age, and blesses distant generations.

Psalm 112:3 Parallel Commentaries

The Desire of the Righteous Granted;
OR, A DISCOURSE OF THE RIGHTEOUS MAN'S DESIRES. ADVERTISEMENT BY THE EDITOR As the tree is known by its fruit, so is the state of a man's heart known by his desires. The desires of the righteous are the touchstone or standard of Christian sincerity--the evidence of the new birth--the spiritual barometer of faith and grace--and the springs of obedience. Christ and him crucified is the ground of all our hopes--the foundation upon which all our desires after God and holiness are built--and the root …
John Bunyan—The Works of John Bunyan Volumes 1-3