(15) Evil diseases.--The word for diseases here used is found only in Deuteronomy (see Deuteronomy 28:60). It must not be forgotten that the law of Moses was in many of its details a sanitary quite as much as a moral code. Some of the associations of this word and the root from which it is derived would seem to point to those "languors" and "infirmities" which arise from neglect and violation of the laws of God, both moral and physical.

Verse 15. - The mercy of God should be showed to them also in preserving them from sickness, especially of a virulent and dangerous kind, such as they had seen in Egypt, where disease has in all ages readily assumed a malignant character ('Encyc. Brit.,' art. 'Egypt'), and where especially cutaneous diseases of the worst kind prevail (comp. Deuteronomy 38:27). Such diseases the Lord would rather cause to fall on their enemies.

7:12-26 We are in danger of having fellowship with the works of darkness if we take pleasure in fellowship with those who do such works. Whatever brings us into a snare, brings us under a curse. Let us be constant to our duty, and we cannot question the constancy of God's mercy. Diseases are God's servants; they go where he sends them, and do what he bids them. It is therefore good for the health of our bodies, thoroughly to mortify the sin of our souls; which is our rule of duty. Yet sin is never totally destroyed in this world; and it actually prevails in us much more than it would do, if we were watchful and diligent. In all this the Lord acts according to the counsel of his own will; but that counsel being hid from us, forms no excuse for our sloth and negligence, of which it is in no degree the cause. We must not think, that because the deliverance of the church, and the destruction of the enemies of the soul, are not done immediately, therefore they will never be done. God will do his own work in his own method and time; and we may be sure that they are always the best. Thus corruption is driven out of the hearts of believers by little and little. The work of sanctification is carried on gradually; but at length there will be a complete victory. Pride, security, and other sins that are common effects of prosperity, are enemies more dangerous than beasts of the field, and more apt to increase upon us.And will take away from thee all sickness,.... Bodily sickness and diseases, prevent the coming of them, or remove them when come:

and will put none of the evil diseases of Egypt which thou knowest upon thee; meaning either the plagues that were inflicted upon them to oblige them to let the Israelites go, of which they had perfect knowledge; or else some noxious and nauseous diseases, which were common among, and peculiar to, the Egyptians, particularly what is called the botch of Egypt; see Exodus 15:26, likewise the leprosy; See Gill on Leviticus 13:2; see Gill on Deuteronomy 28:27.

but will lay them upon all them that hate thee; with which God sometimes punishes his and his people's enemies; see Judges 5:9.