Who will go for us? Isaiah 6:8

JPS Isaiah 6:8
And I heard the voice of the Lord, saying: Whom shall I send, and who will go for us? Then I said: 'Here am I; send me.'

TNK Isaiah 6:8
Then I heard the voice of my Lord saying, "Whom shall I send? Who will go for us?" And I said, "Here am I; send me."

Lord: noun common masculine plural construct suffix 1st person common singular
for us: particle preposition suffix 1st person common plural