Al-An'am - 6:8

وَقَالُواْ لَوْلا أُنزِلَ عَلَيْهِ مَلَكٌ وَلَوْ أَنزَلْنَا مَلَكًا لَّقُضِيَ الأمْرُ ثُمَّ لاَ يُنظَرُونَ
[6:8]
And they say: Why has not an angel been sent down to him? And had We sent down an angel, the matter would have certainly been decided and then they would not have been respited.
They say: "Why is not an angel sent down to him?" If we did send down an angel, the matter would be settled at once, and no respite would be granted them.
They say: Why hath not an angel been sent down unto him? If We sent down an angel, then the matter would be judged; no further time would be allowed them (for reflection).