7:4 To serve other Gods - That is, there is manifest danger of apostacy and idolatry from such matches. Which reason doth both limit the law to such of these as are unconverted (otherwise Salmon married Rahab, Matt 1:5) and enlarge it to other idolatrous nations, as appears from 1Kin 11:2 Ezra 9:2 Neh 13:23.

Deuteronomy 7:4 Parallel Commentaries

Why all Things Work for Good
1. The grand reason why all things work for good, is the near and dear interest which God has in His people. The Lord has made a covenant with them. "They shall be my people, and I will be their God" (Jer. xxxii. 38). By virtue of this compact, all things do, and must work, for good to them. "I am God, even thy God" (Psalm l. 7). This word, Thy God,' is the sweetest word in the Bible, it implies the best relations; and it is impossible there should be these relations between God and His people, and …
Thomas Watson—A Divine Cordial

John's Introduction.
^D John I. 1-18. ^d 1 In the beginning was the Word [a title for Jesus peculiar to the apostle John], and the Word was with God [not going before nor coming after God, but with Him at the beginning], and the Word was God. [Not more, not less.] 2 The same was in the beginning with God. 3 All things were made through him [the New Testament often speaks of Christ as the Creator--see ver. 10; I. Cor. viii. 6; Col. i. 13, 17; Heb. i. 2]; and without him was not anything made that hath been made. [This …
J. W. McGarvey—The Four-Fold Gospel

The Holiness of God
The next attribute is God's holiness. Exod 15:51. Glorious in holiness.' Holiness is the most sparkling jewel of his crown; it is the name by which God is known. Psa 111:1. Holy and reverend is his name.' He is the holy One.' Job 6:60. Seraphims cry, Holy, holy, holy is the Lord of hosts, the whole earth is full of his glory.' Isa 6:6. His power makes him mighty, his holiness makes him glorious. God's holiness consists in his perfect love of righteousness, and abhorrence of evil. Of purer eyes than …
Thomas Watson—A Body of Divinity