(1.) What good reason they had to deal faithfully with God and one another in this covenant, and not to make marriages with the heathen. [1.] They were expressly bound out from such marriages by covenant. God engaged to do them good upon this condition, that they should not mingle with the heathen; this was the covenant of their fathers, the covenant made with their fathers, denoting the antiquity and the authority of it, and its being the great charter by which that nation was incorporated. They lay under all possible obligations to observe it strictly, yet they profaned it, as if they were not bound by it. Those profane the covenant of their fathers who live in disobedience to the command of the God of their fathers. [2.] They were a peculiar people, united in one body, and therefore ought to have united for the preserving of the honour of their peculiarity: Have we not all one Father? Yes, we have, for has not one God created us? Are we not all his offspring? And are we not made of one blood? Yes, certainly we are. God is a common Father to all mankind, and, upon that account, all we are brethren, members one of another, and therefore ought to put away lying (Eph. iv. 25), and not to deal treacherously, no, not any man against his brother. But here it seems to refer to the Jewish nation: Have we not all one father, Abraham, or Jacob? This they prided themselves in, We have Abraham to our father; but here it is turned upon them as an aggravation of their sin in betraying the honour of their nation by intermarrying with heathens: "Has not one God created us, that is, formed us into a people, made us a nation by ourselves, and put a life into us, distinct from that of other nations? And should not this oblige us to maintain the dignity of our character?" Note, The consideration of the unity of the church in Christ, its founder and Father, should engage us carefully to preserve the purity of the church and to guard against all corruptions. [3.] They were dedicated to God, as well as distinguished from the neighbouring nations. Israel was holiness to the Lord (Jer. ii. 3), taken into covenant with him, set apart by him for himself, to be to him for a name and a praise, and upon this account he loved them and delighted in them; the sanctuary set up among them was the holiness of the Lord, which he loved, of which he said, It is my rest for ever, here will I dwell, for I have desired it; but by marrying strange wives they profaned this holiness, and laid the honour of it in the dust. Note, Those who are devoted to God, and beloved of him, are concerned to preserve their integrity, that they may not throw themselves out of his love, nor lose the honour, or defeat the end, of their dedication to him.