Albert Barnes Commentary Proverbs 28:8

"He that augmenteth his substance by interest and increase, Gathereth it for him that hath pity on the poor." — Proverbs 28:8 (ASV)

Unjust gain - Omit “unjust”: “usury and gain” form the concept of “gain derived from usury.” Ill-gotten gains do not prosper; after a time, they pass into hands that know how to use them better.