وَيَقُولُ الَّذِينَ كَفَرُواْ لَوْلا أُنزِلَ عَلَيْهِ آيَةٌ مِّن رَّبِّهِ إِنَّمَا أَنتَ مُنذِرٌ وَلِكُلِّ قَوْمٍ هَادٍ
[13:7]
And those who disbelieve say: Why has not a sign been sent down upon him from his Lord? You are only a warner and (there is) a guide for every people.
And the Unbelievers say: "Why is not a sign sent down to him from his Lord?" But thou art truly a warner, and to every people a guide.
Those who disbelieve say: If only some portent were sent down upon him from his Lord! Thou art a warner only, and for every folk a guide.