The Word Says:

“O house of Jacob, come ye, and let us walk in the light of the LORD.”

Verse Thoughts:

O house of Jacob;
This is either an exhortation of the prophet to the men of his generation, to attend to the light of the law, which the Lord had given them, as Aben Ezra and Kimchi; or rather, as the Targum and Jarchi suggest, an exhortation of the nations to the people of Israel, and are indeed the words of the converted Gentiles to the people of the Jews, being concerned for their conversion and spiritual welfare, as will appear in the latter day; when they will not only encourage one another to go up to the house of the Lord, as in the preceding verses, but will be very solicitous that the Jews, the posterity of Jacob, share with them in all that light and glory that shall be risen upon Zion; as follows:

come ye, and let us walk in the light of the Lord;
meaning either Christ, in whom the light of the knowledge of the glory of God is given, and the glory of all the perfections of the divine nature is displayed; who is that light that dwells with the Lord, was sent forth by him, and came into this world as the light of it, and is given for a light to the Gentiles, as well as the glory of the people of Israel; and who is the author of all light; of corporeal light, in the first creation; of the sun, moon, and stars; of the light of nature in every man; of the light of the Gospel of the grace of God; of the spiritual light of grace in the hearts of his people; and of the light of eternal glory: or else the Gospel is intended, called the light of the glorious Gospel of Christ, by which some are only notionally enlightened, and some spiritually and savingly, when it is attended with the spirit of wisdom and revelation in the knowledge of Christ: or rather, the light of the latter day glory, which includes the other two; when Christ and his Gospel will be more clearly revealed and seen, not only by the watchmen, who will see eye to eye, but by all the saints; when the light of the moon shall be as the light of the sun, and the light of the sun sevenfold as the light of seven days, and the whole earth shall be lightened with its glory,  and to “walk” in this light, as it respects Christ, is to walk by faith in him, to go on in believing views of him, and to walk in imitation of him, and as he directs; and as it respects the Gospel, it is to embrace it, profess it, hold it fast, and hold it forth; and to walk as that prescribes and guides, and as becomes it; and to walk as children of the light, wisely and circumspectly; worthy of the calling of God, of the grace he calls by, and the kingdom he calls to: and to walk in the light of the latter day glory is to enjoy it, and share in all the blessings of it, with perseverance therein, through the grace of God; and such walking is pleasant and comfortable; such shall have the communion of God and Christ, and fellowship one with another, and at last enjoy the light of life.