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.”

2:10

“In their hearts is a disease (of doubt and hypocrisy) and Allah has increased their disease. A painful torment is theirs because they used to tell lies.”

3:159

“And by the Mercy of Allah, you dealt with them gently. And had you been severe and harsh hearted, they would have broken away from about you; so pass over (their faults), and ask (Allah’s) Forgiveness for them; and consult them in the affairs. Then when you have taken a decision, put your trust in Allah, certainly, Allah loves those who put their trust (in Him)” (Qur’an 3:159)