Surah At-Tawbah, Verse 113

مَا كَانَ لِلنَّبِيِّ وَٱلَّذِينَ ءَامَنُوٓاْ أَن يَسۡتَغۡفِرُواْ لِلۡمُشۡرِكِينَ وَلَوۡ كَانُوٓاْ أُوْلِي قُرۡبَىٰ مِنۢ بَعۡدِ مَا تَبَيَّنَ لَهُمۡ أَنَّهُمۡ أَصۡحَٰبُ ٱلۡجَحِيمِ١١٣

mā kāna lilnnabiyyi wa-alladhīna āmanū an yastaghfirū lil'mush'rikīna walaw kānū ulī qur'bā min baʿdi mā tabayyana lahum annahum aṣḥābu l-jaḥīmi

It is not for the Prophet and those who have believed to ask forgiveness for the polytheists, even if they were relatives, after it has become clear to them that they are companions of Hellfire.