Sura al-Aḥzāb 33:5

ٱدْعُوهُمْ لِءَابَآئِهِمْ هُوَ أَقْسَطُ عِندَ ٱللَّـهِ فَإِن لَّمْ تَعْلَمُوٓا۟ ءَابَآءَهُمْ فَإِخْوَٰنُكُمْ فِى ٱلدِّينِ وَمَوَٰلِيكُمْ وَلَيْسَ عَلَيْكُمْ جُنَاحٌ فِيمَآ أَخْطَأْتُم بِهِۦ وَلَٰكِن مَّا تَعَمَّدَتْ قُلُوبُكُمْ وَكَانَ ٱللَّـهُ غَفُورًا رَّحِيمًا

adʿūhum liābāihim huwa aqsaṭu ʿinda allāhi fa-in lam taʿlamū ābāʾahum fa-ikhwānukum fī l-dīni wa-mawālīkum wa-laysa ʿalaykum junāḥun fīmā akhṭatum bihi wa-lākin mā taʿammadat qulūbukum wa-kāna allāhu ghafūran raḥīman

Call them by (the names of) their fathers: that is juster in the sight of Allah. But if ye know not their father's (names, call them) your Brothers in faith, or your maulas. But there is no blame on you if ye make a mistake therein: (what counts is) the intention of your hearts: and Allah is Oft-Returning, Most Merciful.