In Surah Ibrahim (( And We have not sent any messenger except in the language of his people to explain to them, so that Allah may lead astray whomever He wills and guide whomever He wills, and He is the Almighty, the Wise, the Wise.)
And in Surat al-Qiyamah (((Then it is up to us to explain it))
And in Surah al-Tawbah (( And Allah would not lead a people astray after He has guided them until He shows them what they should fear, for Allah is all-knowing.)
In Surah Al-Israa (( Whoever is guided, he will be guided for himself, and whoever goes astray, he will go astray for himself, and there is no need to put one weight on another weight, and we were not punishing until we sent a messenger.)
Only those who have read the two books of The Awaited Messages will be able to reflect on these verses and realise what will be the state of the people when the Mahdi appears in the future, and God knows best.