Proverbs 28:27

Here is, 1. A promise to the charitable: He that gives to the poor shall himself be never the poorer for so doing; he shall not lack. If he have but little, and so be in danger of lacking, let him give out of his little, and that will prevent it from coming to nothing; as the bounty of the widow of Sarepta to Elijah (for whom she made a little cake first) saved what she had, when it was reduced to a handful of meal. If he have much, let him give much out of it, and that will prevent its growing less; he and his shall not want what is given in pious charity. What we gave we have. 2. A threatening to the uncharitable: He that hides his eyes, that he may not see the miseries of the poor nor read their petitions, lest his eye should affect his heart and extort some relief from him, he shall have many a curse, both from God and man, and neither causeless, and therefore they shall come. Woeful is the condition of that man who has the word of God and the prayers of the poor against him.

— Matthew Henry's Concise Commentary (public domain)

(Compare Pro 11:24-26). hideth his eyes--as the face (Psa 27:9; Psa 69:17), denotes inattention.

— Jamieson-Fausset-Brown Commentary (public domain)