The Rocky Tract - 15:8 We do not send the angels except for a definite purpose, and then no one is given a deadline.
What else did they ask to believe?
The Cow/2:210 Are they waiting for Allah and the angels to come to them from the dense clouds? Then everything would be over and everything would be returned to Allah.

The Women/4:153 "The people of the Book ask you to send down to them a Book from the sky. They had asked Moses for something greater than that and said, "Show us Allah physically". They were struck by lightning because of their transgression. They served the calf even after clear proofs came to them. Again We forgave them, and We gave Moses a clear authority."

The Cattle/6:8 "They say, "Should not an angel have been sent down to him!"If We had sent down an angel, the work would have been finished. They would not have been given time."

Prophet Hud/11:12 "Perhaps your chest will be constricted and you will abandon some of what has been revealed to you because they say, "Should not a treasure have descended to him, or an angel with him?"You are only a warner; Allah is the Controller of all things."

The Rocky Tract/15:6 "They said: "O you who have been sent down the Message, you are a madman."
The Rocky Tract/15:7 Bring us the angels if you are truthful.

The Night Journey/17:90 "They said: "We will not believe in you until you make a spring spring up for us from the earth."
The Night Journey/17:91 Or you should have gardens of dates and grapes and make rivers gush forth between them.
The Night Journey/17:92 Or you should make pieces of the sky fall on us, as you claim, or you should bring Allah and the angels before us.
The Night Journey/17:93 "Or you should have a house of gold, or you should ascend to heaven. Even if you ascend, we will not believe in it until you send down upon us a Book that we may read."Say: "Great is my Lord. Am I but a human being, a messenger?"

The Criterion/25:7 "And they said, "How is it that this messenger eats and walks in the markets? Why should not an angel have descended with him as a warner?"
The Criterion/25:8 "Or if a treasure had been thrown to him, or if he had a garden and he ate from it!"Even the wrongdoers said, "You are following a bewitched man"."