Charles Ellicott Commentary Isaiah 33:15-16

"He that walketh righteously, and speaketh uprightly; he that despiseth the gain of oppressions, that shaketh his hands from taking a bribe, that stoppeth his ears from hearing of blood, and shutteth his eyes from looking upon evil: He shall dwell on high; his place of defence shall be the munitions of rocks; his bread shall be given [him]; his waters shall be sure." — Isaiah 33:15-16 (ASV)

He that walketh righteously ... —The answer to the question shows that the words point not to endless punishments, but to the infinite holiness of God. The man who is true and just in all his dealings can dwell in closest fellowship with that holiness which is to others as a consuming fire. To him it is a protection and defence, a “rock fortress,” in which he can dwell securely, where he will find all that he needs for the sustenance of soul and body, the bread and the water of life. The picture of the righteous man is in part an echo, probably a conscious echo, of Psalm 15 and Psalm 24.