6-10. For thou art an holy people unto the Lord thy God--that is, set apart to the service of God, or chosen to execute the important purposes of His providence. Their selection to this high destiny was neither on account of their numerical amount (for, till after the death of Joseph, they were but a handful of people); nor because of their extraordinary merits (for they had often pursued a most perverse and unworthy conduct); but it was in consequence of the covenant or promise made with their pious forefathers; and the motives that led to that special act were such as tended not only to vindicate God's wisdom, but to illustrate His glory in diffusing the best and most precious blessings to all mankind.

JFB.