Ingratitude (Kufr)

فَٱذْكُرُونِىٓ أَذْكُرْكُمْ وَٱشْكُرُوا۟ لِى وَلَا تَكْفُرُونِ

So remember Me; I will remember you. And be grateful to Me and do not deny Me.

وَلَئِنْ أَذَقْنَا ٱلْإِنسَـٰنَ مِنَّا رَحْمَةً ثُمَّ نَزَعْنَـٰهَا مِنْهُ إِنَّهُۥ لَيَـُٔوسٌ كَفُورٌ

And if We give man a taste of mercy from Us and then We withdraw it from him, indeed, he is despairing and ungrateful.

وَإِذْ تَأَذَّنَ رَبُّكُمْ لَئِن شَكَرْتُمْ لَأَزِيدَنَّكُمْ ۖ وَلَئِن كَفَرْتُمْ إِنَّ عَذَابِى لَشَدِيدٌ

And [remember] when your Lord proclaimed, 'If you are grateful, I will surely increase you [in favor]; but if you deny, indeed, My punishment is severe.'"

وَهُوَ ٱلَّذِىٓ أَحْيَاكُمْ ثُمَّ يُمِيتُكُمْ ثُمَّ يُحْيِيكُمْ ۗ إِنَّ ٱلْإِنسَـٰنَ لَكَفُورٌ

And He is the one who gave you life; then He causes you to die and then will [again] give you life. Indeed, mankind is ungrateful.