6:39
وَٱلَّذِينَ كَذَّبُوا۟ بِـَٔايَٰتِنَا صُمٌّۭ وَبُكْمٌۭ فِى ٱلظُّلُمَٰتِ ۗ مَن يَشَإِ ٱللَّهُ يُضْلِلْهُ وَمَن يَشَأْ يَجْعَلْهُ عَلَىٰ صِرَٰطٍۢ مُّسْتَقِيمٍۢ
But those who deny Our verses are deaf and dumb within darknesses. Whomever Allah wills - He leaves astray; and whomever He wills - He puts him on a straight path.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
The Idolators Ask for a Miracle
Allah states that the idolators used to proclaim, "Why does not (Muhammad) bring an Ayah from his Lord," meaning, a miracle of their choice! They would sometimes say,
لَن نُّؤْمِنَ لَكَ حَتَّى تَفْجُرَ لَنَا مِنَ الاٌّرْضِ يَنْبُوعًا
("We shall not believe in you, until you cause a spring to gush forth from the ground for us.") 17:90.
قُلْ إِنَّ اللَّهَ قَادِرٌ عَلَى أَن يُنَزِّلٍ ءايَةً وَلَـكِنَّ أَكْثَرَهُمْ لاَ يَعْلَمُونَ
(Say: "Allah is certainly able to send down a sign, but most of them know not.") Certainly, Allah is able to send an Ayah (sign). But, He decided out of His wisdom to delay that, because if He sends an Ayah of their liking and they still do not believe, this will hasten their punishment as with the previous nations. Allah said in other Ayat,