وَقَالُوا لَوْلَا نُزِّلَ عَلَيْهِ آيَةٌ مِّن رَّبِّهِ ۚ قُلْ إِنَّ اللَّهَ قَادِرٌ عَلَىٰ أَن يُنَزِّلَ آيَةً وَلَٰكِنَّ أَكْثَرَهُمْ لَا يَعْلَمُونَ (37)
(6:37) And they say: 'Why has no miraculous sign been sent down to him from his Lord?' Say: 'Surely Allah has the power to send down a sign, but most of them do not know. *26
*26). The word ayah here signifies a tangible miracle. The purpose of the verse is to point out that the reason for not showing a miraculous sign is not God's powerlessness. The true reason is something else which those people in their immaturity, have failed to comprehend.