Surah Aali Imran (The Family of Imran), Verse 90

اِنَّ الَّذِیْنَ كَفَرُوْا بَعْدَ اِیْمَانِهِمْ ثُمَّ ازْدَادُوْا كُفْرًا لَّنْ تُقْبَلَ تَوْبَتُهُمْ وَاُولٰٓىِٕكَ هُمُ الضَّآلُّوْنَ ۟

Innal lazeena kafaroo ba'da eemaanihim summaz daadoo kufral lan tuqbala tawbatuhum wa ulaaa'ika humud daaalloon

“But those who reject Faith after they accepted it, and then go on adding to their defiance of Faith,- never will their repentance be accepted; for they are those who have (of set purpose) gone astray.”

Quran 3:90 (Yusuf Ali Translation)