Nahj al-Balāgha
Hadith 1577وَاللهِ إِنَّهُ لَحَقٌّ مَعَ مُحِقٍّ، وَمَا أُبَالِي مَا صَنَعَ الْمُلْحِدُونَ، وَالسَّلَامُ.
By Allāh, this is the case of right with the rightful person and we do not care what the heretics do; and that is an end to the matter.