وَمَا كَانَ ٱللَّهُ لِيُضِلَّ قَوْمًۢا بَعْدَ إِذْ هَدَىٰهُمْ حَتَّىٰ يُبَيِّنَ لَهُم مَّا يَتَّقُونَ ۚ إِنَّ ٱللَّهَ بِكُلِّ شَىْءٍ عَلِيمٌ
“Allah would never consider a people deviant after He has guided them, until He makes clear to them what they must avoid. Surely Allah has [full] knowledge of everything.”
Part of the same Abraham's-prayer-for-his-father passage as 9:113 (already linked to this event), explaining the limits of seeking forgiveness for a mushrik relative.