Aal-'Imran - 3:90

إِنَّ الَّذِينَ كَفَرُواْ بَعْدَ إِيمَانِهِمْ ثُمَّ ازْدَادُواْ كُفْرًا لَّن تُقْبَلَ تَوْبَتُهُمْ وَأُوْلَـئِكَ هُمُ الضَّآلُّونَ
[3:90]
Surely, those who disbelieve a,fter their believing, then increase in unbelief, their repentance shall not be accepted, and these are they that go astray.
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.
Lo! those who disbelieve after their (profession of) belief, and afterward grow violent in disbelief: their repentance will not be accepted. And such are those who are astray.