I have made the earth - God here asserts that he had made all things, doubtless with a view to show that he was able to hear their cry, and to grant an answer to their requests. His agency was visible everywhere, alike in forming and sustaining all things, and in raising up for them a deliverer. They might, therefore, go before him with confidence, and spread out all their needs.
Have stretched out the heavens - (See the notes at Isaiah 40:26).
And all their host - The stars (see the notes at Isaiah 40:26).
Have I commanded - All are under my direction and control. What more can be needed by his people than the friendship and protection of him who made the heavens and the earth, and who leads on the stars!