Al-Quran, Sura 4: Ayat 137-140

(137) إِنَّ ٱلَّذِينَ ءَامَنُواْ ثُمَّ كَفَرُواْ ثُمَّ ءَامَنُواْ ثُمَّ كَفَرُواْ ثُمَّ ٱزۡدَادُواْ كُفۡرًا لَّمۡ يَكُنِ ٱللَّهُ لِيَغۡفِرَ لَهُمۡ وَلَا لِيَهۡدِيَهُمۡ سَبِيلًۢا
(138) بَشِّرِ ٱلۡمُنَٰفِقِينَ بِأَنَّ لَهُمۡ عَذَابًا أَلِيمًا
(139) ٱلَّذِينَ يَتَّخِذُونَ ٱلۡكَٰفِرِينَ أَوۡلِيَآءَ مِن دُونِ ٱلۡمُؤۡمِنِينَۚ أَيَبۡتَغُونَ عِندَهُمُ ٱلۡعِزَّةَ فَإِنَّ ٱلۡعِزَّةَ لِلَّهِ جَمِيعًا
(140) وَقَدۡ نَزَّلَ عَلَيۡكُمۡ فِى ٱلۡكِتَٰبِ أَنۡ إِذَا سَمِعۡتُمۡ ءَايَٰتِ ٱللَّهِ يُكۡفَرُ بِهَا وَيُسۡتَهۡزَأُ بِهَا فَلَا تَقۡعُدُواْ مَعَهُمۡ حَتَّىٰ يَخُوضُواْ فِى حَدِيثٍ غَيۡرِهِۦٓۚ إِنَّكُمۡ إِذًا مِّثۡلُهُمْۗ إِنَّ ٱللَّهَ جَامِعُ ٱلۡمُنَٰفِقِينَ وَٱلۡكَٰفِرِينَ فِى جَهَنَّمَ جَمِيعًا

English – Sahih International

(137) Indeed, those who have believed then disbelieved, then believed, then disbelieved, and then increased in disbelief – never will Allah forgive them, nor will He guide them to a way.
(138) Give tidings to the hypocrites that there is for them a painful punishment –
(139) Those who take disbelievers as allies instead of the believers. Do they seek with them honor [through power]? But indeed, honor belongs to Allah entirely.
(140) And it has already come down to you in the Book that when you hear the verses of Allah [recited], they are denied [by them] and ridiculed; so do not sit with them until they enter into another conversation. Indeed, you would then be like them. Indeed Allah will gather the hypocrites and disbelievers in Hell all together –

Bengali – Bayaan Foundation

Al-QURAN, Sura 16: Ayat 106
مَن كَفَرَ بِٱللَّهِ مِنۢ بَعۡدِ إِيمَٰنِهِۦٓ إِلَّا مَنۡ أُكۡرِهَ وَقَلۡبُهُۥ مُطۡمَئِنٌّۢ بِٱلۡإِيمَٰنِ وَلَٰكِن مَّن شَرَحَ بِٱلۡكُفۡرِ صَدۡرًا فَعَلَيۡهِمۡ غَضَبٌ مِّنَ ٱللَّهِ وَلَهُمۡ عَذَابٌ عَظِيمٌ

English – Sahih International
Whoever disbelieves in Allah after his belief… except for one who is forced [to renounce his religion] while his heart is secure in faith. But those who [willingly] open their breasts to disbelief, upon them is wrath from Allah, and for them is a great punishment.