Charles Ellicott Commentary Ecclesiastes 2:26

"For to the man that pleaseth him [God] giveth wisdom, and knowledge, and joy; but to the sinner he giveth travail, to gather and to heap up, that he may give to him that pleaseth God. This also is vanity and a striving after wind." — Ecclesiastes 2:26 (ASV)

On the doctrine that the wicked amass wealth for the righteous, see marginal references.