Quran

وَيَقُولُ ٱلَّذِينَ كَفَرُواْ لَوۡلَآ أُنزِلَ عَلَيۡهِ ءَايَةٞ مِّن رَّبِّهِۦٓۗ إِنَّمَآ أَنتَ مُنذِرٞۖ وَلِكُلِّ قَوۡمٍ هَادٍ

And those who disbelieved say, "Why has a sign not been sent down to him from his Lord?" You are only a warner, and for every people is a guide