Sura al-Mujādilah 58:2

ٱلَّذِينَ يُظَٰهِرُونَ مِنكُم مِّن نِّسَآئِهِم مَّا هُنَّ أُمَّهَٰتِهِمْ إِنْ أُمَّهَٰتُهُمْ إِلَّا ٱلَّٰٓـِٔى وَلَدْنَهُمْ وَإِنَّهُمْ لَيَقُولُونَ مُنكَرًا مِّنَ ٱلْقَوْلِ وَزُورًا وَإِنَّ ٱللَّـهَ لَعَفُوٌّ غَفُورٌ

lladhīna yuẓāhirūna minkum min nisāʾihim mā hunna ummahātihim in ummahātuhum illā allāī waladnahum wa-innahum la-yaqūlūna munkaran mina l-qawli wa-zūran wa-inna allāha laʿafūwun ghafūrun

If any men among you divorce their wives by Zihar (calling them mothers), they cannot be their mothers: None can be their mothers except those who gave them birth. And in fact they use words (both) iniquitous and false: but truly Allah is one that blots out (sins), and forgives (again and again).