Charles H. Spurgeon on Psalms 105:15

Saying, touch not mine anointed, and do my prophets no harm. Abraham and his seed were in the midst of the world a generation of priests anointed to present sacrifice unto the most High God; since to them the oracles were committed, they were also the prophets of mankind; and they were kings too —a royal priesthood; hence they had received a threefold anointing. Their holy office surrounded them with a sacredness which rendered it sacrilege to molest them. The Lord was pleased to impress the wild tribes of Canaan with a respectful awe of the pious strangers who had come to abide with them, so that they came not near them to do them ill. The words here mentioned may not have been actually spoken, but the impression of awe which fell upon the nations is thus poetically described. God will not have those touched who have been set apart unto himself He calls them his own, saying, "Mine anointed" he declares that he has "anointed" them to be prophets, priests, and kings unto himself, and yet again he claims them as his prophets —"Do my prophets no harm." All through the many years in which the three great fathers dwelt in Canaan no man was able to injure them; they were not able to defend themselves by force of arms; but the eternal God was their refuge. Even so at this present time the remnant according to the election of grace cannot be destroyed, nay, nor so much as touched, without the divine consent. Against the church of Christ the gates of hell cannot prevail. In all this we see reasons for giving thanks unto the Lord, and proclaiming his name according to the exhortation of the first verse of the Psalm. Here ends the portion which was sung at the moving of the ark: its fitness to be used for such a purpose is very manifest, for the ark was the symbol both of the covenant and of that mystic dwelling of God with Israel which was at once her glory and her defence. None could touch the Lord's peculiar ones, for the Lord was among them, flaming forth in majesty between the cherubims. The presence of God having remained with his chosen ones while they sojourned in Canaan, it did not desert them when they were called to go down into Egypt. They did not go there of their own choice, but under divine direction, and hence the Lord prepared their way and prospered them until he saw fit to conduct them again to the land of promise.