Prophetic integrity and trustworthiness

إِنِّى لَكُمْ رَسُولٌ أَمِينٌ

Indeed, I am to you a trustworthy messenger.

مَا ضَلَّ صَاحِبُكُمْ وَمَا غَوَىٰ

Your companion [i.e., Muḥammad] has not strayed, nor has he erred,