Prophet Hud - 11:27
"The leaders of his people who disbelieved said, "We see that you are only a man like us, and we see that no one follows you except the shallow-minded rabble among us. Nor do we see any superiority in you over us. On the contrary, we think that you are liars."
Why a human messenger?
The Night Journey/17:95
"Say: "If there were angels inhabiting the earth, We would have sent to them an angel from heaven as a messenger."