Al An’am Ayah 8

وَقَالُواْ لَوْلَآ أُنزِلَ عَلَيْهِ مَلَكٌ‌ۖ وَلَوْ أَنزَلْنَا مَلَكًا لَّقُضِىَ ٱلْأَمْرُ ثُمَّ لَا يُنظَرُونَ ٨ They say, “Why has no ?visible? angel come with him?” Had We sent down an angel, the matter would have certainly been settled ?at once?, and they would have never been given more time ?to repent?.