وَقَالُوا۟ لَوْلَآ أُنزِلَ عَلَيْهِ مَلَكٌ ۖ وَلَوْ أَنزَلْنَا مَلَكًا لَّقُضِىَ ٱلْأَمْرُ ثُمَّ لَا يُنظَرُونَ
2:211; 25:8.
Commentary:
The question, Why has not an angel been sent down to him, implies a desire on the part of the disbelievers to be visited by an angel whom they might see and be thus convinced of the divine mission of the Prophet. The Quran exposes their folly by replying that although the angels of God do come to the Prophet, yet when they visit disbelievers and are seen by them, they invariably come with Divine punishment. Such angels appeared at the Battle of Badr, when, to quote the expression of the Quran, the matter was decided (2:211). See also the succeeding verse.