﴿ ٱدْعُوهُمْ لِءَابَآئِهِمْ هُوَ أَقْسَطُ عِندَ ٱللَّهِ ۚ فَإِن لَّمْ تَعْلَمُوٓا۟ ءَابَآءَهُمْ فَإِخْوَٰنُكُمْ فِى ٱلدِّينِ وَمَوَٰلِيكُمْ ۚ وَلَيْسَ عَلَيْكُمْ جُنَاحٌۭ فِيمَآ أَخْطَأْتُم بِهِۦ وَلَٰكِن مَّا تَعَمَّدَتْ قُلُوبُكُمْ ۚ وَكَانَ ٱللَّهُ غَفُورًۭا رَّحِيمًا ﴾

“[As for your adopted children,] call them by their [real] fathers’ names: this is more equitable in the sight of God; and if you know not who their fathers were, [call them] your brethren in faith and your friends. However, you will incur no sin if you err in this respect: [what really matters is] but what your hearts intend - for God is indeed much-forgiv­ing, a dispenser of grace!”

Instead attribute them to their true fathers. That is more equitable that is more just in the sight of God. If you do not know their true fathers then they are your brethren in religion and as your associates. And you would not be at fault for any mistake you make in this respect except in what your hearts may premeditate after the prohibition has been issued. And God is Forgiving of whatever you said before the prohibition was issued Merciful to you in this respect.