17:46

“And We have put coverings over their hearts lest they should understand it (the Qur’an), and in their ears deafness. And when you make mention of your Lord Alone [La ilaha illallah (none has the right to be worshipped but Allah) Islamic Monotheism in the Qur’an, they turn on their backs, fleeing in extreme dislike.”

26:89 pt. 1

“Except him who comes to Allah with a clean heart [clean from Shirk (polytheism) and Nifaq (hypocrisy)].” ( Qur’an 26:89)