John Calvin 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. He sharply rebukes the Jews by holding out the example of the Gentiles. For since, as a consequence of the spread of His kingdom, God would give law to all nations from Mount Zion, so as to graft them into the body of His chosen people, nothing could be more strange than for the house of Jacob to revolt from Him, and for the members of the household, who ought to have been foremost, to withdraw when strangers were drawing near. This is, therefore, not only an extremely forceful exhortation but also a heavy and sharp complaint. Accordingly, he addresses them by an honorable name, saying, O house of Jacob, come; so that he may express more strongly their ingratitude, which was evident in the fact that though they were God’s first-born in the Church, they utterly renounced that right of inheritance which they held in common with others.

There is, therefore, an implied comparison, as if he had said, “Look, the Gentiles flow together to Mount Zion, and everyone exhorts and urges on his neighbor; they submit to receive instruction from God and to be reproved by Him; and why do you, O Israelites, you who are the inheritance of God, why do you draw back? Shall the Gentiles submit to God, and shall you refuse to acknowledge His authority? Has so great a light been kindled in every part of the world, and shall you not be enlightened by it? Shall so many waters flow, and will you not drink? What madness is this, that when the Gentiles run so eagerly, you remain idle?”

And we will walk in the light of the Lord. When he adds we will walk, he means that the light is placed before their feet, but they disregard it by shutting their eyes and even extinguish it as far as it lies in their power; and yet its brightness draws distant nations to it.