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."
Related:
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 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"."
The Criterion/25:21
"Those who did not expect to meet Us said: "Either angels should descend on us or we should see our Lord". They were arrogant to themselves and had gone far in rebellion."