Adam Clarke on John 12:41

When he saw his glory - Isa 6:1, etc. I saw Jehovah, said the prophet, sitting upon a throne, high and lifted up, and his train filled the temple. Above it stood the seraphim; and one cried unto another, and said, Holy, holy, holy, is Jehovah, God of hosts; the whole earth shall be full of his glory! It appears evident, from this passage, that the glory which the prophet saw was the glory of Jehovah: John, therefore, saying here that it was the glory of Jesus, shows that he considered Jesus to be Jehovah. See Bishop Pearce. Two MSS. and a few versions have Θεου, and του Θεου αὑτου, the glory of God, or of his God.