وَكَيْفَ تَكْفُرُونَ وَأَنتُمْ تُتْلَى عَلَيْكُمْ آيَاتُ اللَّهِ وَفِيكُمْ رَسُولُهُ وَمَن يَعْتَصِم بِاللَّهِ فَقَدْ هُدِيَ إِلَى صِرَاطٍ مُّسْتَقِيمٍ
And how would you be faithless while the signs of Allah are recited to you and His Apostle is in your midst? Whoever takes recourse in Allah is certainly guided to a straight path.
Agha Ali Puya Commentary
Commentary on Quran 3:101
[Pooya/Ali Commentary 3:101] No rational and intelligent person can remain a disbeliever after the arrival of the Holy Prophet in this world with the Quran. So long as the people hold fast to the Quran and his Ahl ul Bayt, the two weighty things (see hadith al thaqalayn on page 6) they will not go back to paganism.