Al-Mujadila 58:2

ٱلَّذِينَ يُظَٰهِرُونَ مِنكُم مِّن نِّسَآئِهِم مَّا هُنَّ أُمَّهَٰتِهِمۡۖ إِنۡ أُمَّهَٰتُهُمۡ إِلَّا ٱلَّـٰٓـِٔي وَلَدۡنَهُمۡۚ وَإِنَّهُمۡ لَيَقُولُونَ مُنكَرٗا مِّنَ ٱلۡقَوۡلِ وَزُورٗاۚ وَإِنَّ ٱللَّهَ لَعَفُوٌّ غَفُورٞ 2

Those who pronounce thihar among you [to separate] from their wives - they are not [consequently] their mothers. Their mothers are none but those who gave birth to them. And indeed, they are saying an objectionable statement and a falsehood. But indeed, Allah is Pardoning and Forgiving