وَيَقُولُ الَّذِينَ كَفَرُوا لَوْلَا أُنْزِلَ عَلَيْهِ آيَةٌ مِنْ رَبِّهِ ۗ إِنَّمَا أَنْتَ مُنْذِرٌ ۖ وَلِكُلِّ قَوْمٍ هَادٍ
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 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. (13:7) -Shakir
Excerpt from Tafseer of Agha Mahdi Pooya1:
The Qur’an treats the miracles as subordinate to the moral and spiritual evidences and signs demonstrated by the Holy Prophet, who was sent as a warner.
Refer to the commentary of al Baqarah: 118. "And for every people there is a guide."(2:118)
Tha’labi in his Tafseer relates on the authority of Ibn Abbas that when this verse was revealed the Holy Prophet said: "I am the warner and Ali is the guide. O Ali, through you those who are guided will receive true guidance."
This tradition has also been reported and confirmed by Ibn Marduwayh, Ibn Hatim, Tabarani, Ibn Asakir, Suyuti, Ahmad bin Hambal, Fakhruddin Razi and Abu Nu’aym.
Imam Muhammad bin Ali al Baqir also said that "the warner" means the Holy Prophet and "the guide" means Ali and added "the authority to guide continues among us".