وَقَالُوا لَوْلَا أُنزِلَ عَلَيْهِ آيَاتٌ مِّن رَّبِّهِ ۖ قُلْ إِنَّمَا الْآيَاتُ عِندَ اللَّهِ وَإِنَّمَا أَنَا نَذِيرٌ مُّبِينٌ (50)
(29:50) They say: 'Why were Signs *90 from his Lord not sent down upon him?' Say: 'The Signs are only with Allah. As for me, I am no more than a plain warner.'
*90) That is, miracles by seeing which one may be convinced that Muhammad (upon whom be Allah's peace) is really a Prophet of Allah.