Albert Barnes Commentary Isaiah 2:5

"O house of Jacob, come ye, and let us walk in the light of Jehovah." — Isaiah 2:5 (ASV)

O house of Jacob - This is a direct address, or exhortation, of the prophet to the Jews. It is made given that God had gracious purposes toward them. He intended to distinguish them by making them the source of blessings to all nations. As this was to be their high destiny, he exhorts them to devote themselves to him, and to live to his honor. The word “house” here means the “family, or nation.” The phrase is applied to the Jews because their tribes were descended from the twelve sons of Jacob.

Let us walk - Let us “live.” The word “walk” is often used to denote human life or conduct (Romans 6:4; Romans 8:1; 1 Corinthians 5:7; Galatians 6:16, ...).

In the light of the Lord - The sense of this is: Let us obey the commandments of Yahweh; or, as the Chaldee expresses it, ‘Let us walk in the doctrine of the law of the Lord.’ The idea may be expressed this way: ‘Let us not walk in the darkness and error of sin and idolatry, but in the light or instruction which God sheds upon us by his law. He teaches us what we should do, and let us obey him.’ “Light” is often, in the Scriptures, used to represent instruction or teaching (compare the note at Matthew 4:16; the note at John 1:4; also, the note at Ephesians 5:8).