“who will go for us?” Who God is speaking to is not specifically stated in this verse. God wanted to send someone to help Israel, so He asked for advice. Isaiah writes: “I heard the voice of the Lord, saying, ‘Whom should I send, and who will go for us?’ Then I said, ‘Here I am. Send me!’” (Isa. 6:8). We should first notice the interplay between the “I” in “Whom shall I send,” and the “us” in “…who will go for us?” The text is showing that God is in charge, but He is supported by, and asking advice from, others.
The context shows that God is appealing to others who support Him in His desire to help Israel, and so the “others” in this context cannot be the full assembly of spirits, because some of them did not support Him. Given what we know about God’s divine council from other places in Scripture, it is logical that God is speaking to His divine council and asking them about who He could send to do His work. [For more information on God’s divine council, see commentary on Genesis 1:26].
We must also note that God is asking for someone to go, not picking someone and telling them to go. Believers have freewill and to be of true service to God must desire to serve Him. God wants us to love God and want to serve Him; He does not want unwilling or even half-willing servants. People should want to serve God, after all, He is our creator and sustainer, but people are selfish and self-centered, and mostly want only what makes them happy at the time. But for those that do have a heart to serve, God will bless them now and reward them richly in the next life. [For more on rewards in the coming kingdom of Jesus Christ, see commentary on 2 Cor. 5:10, “good or worthless”].