يَحۡلِفُونَ بِٱللَّهِ مَا قَالُواْ وَلَقَدۡ قَالُواْ كَلِمَةَ ٱلۡكُفۡرِ وَكَفَرُواْ بَعۡدَ إِسۡلَٰمِهِمۡ وَهَمُّواْ بِمَا لَمۡ يَنَالُواْۚ وَمَا نَقَمُوٓاْ إِلَّآ أَنۡ أَغۡنَىٰهُمُ ٱللَّهُ وَرَسُولُهُۥ مِن فَضۡلِهِۦۚ فَإِن يَتُوبُواْ يَكُ خَيۡرٗا لَّهُمۡۖ وَإِن يَتَوَلَّوۡاْ يُعَذِّبۡهُمُ ٱللَّهُ عَذَابًا أَلِيمٗا فِي ٱلدُّنۡيَا وَٱلۡأٓخِرَةِۚ وَمَا لَهُمۡ فِي ٱلۡأَرۡضِ مِن وَلِيّٖ وَلَا نَصِيرٖ

Yahlifoona billaahi ma qaaloo wa laqad qaaloo kalimatal kufri wa kafaroo ba'da Islaamihim wa hammoo bimaa lam yanaaloo; wa maa naqamooo illaaa an aghnaa humullaahu wa Rasooluhoo min fadlih; fainy yatooboo yaku khairal lahum wa iny yatawal law yu'az zibhumullaahu 'azaaban aleeman fiddunyaa wal Aakhirah; wamaa lahum fil ardi minw waliyyinw wa laa naseer

They swear by Allah that they said nothing (evil), but indeed they uttered blasphemy, and they did it after accepting Islam; and they meditated a plot which they were unable to carry out: this revenge of theirs was (their) only return for the bounty with which Allah and His Messenger had enriched them! If they repent, it will be best for them; but if they turn back (to their evil ways), Allah will punish them with a grievous penalty in this life and in the Hereafter: They shall have none on earth to protect or help them.

— At-Taubah (ٱلتَّوْبَة), 9:74