Verse 226

لِّلَّذِينَ يُؤْلُونَ مِن نِّسَآئِهِمْ تَرَبُّصُ أَرْبَعَةِ أَشْهُرٍ فَإِن فَآءُو فَإِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ

For those who estrange their wives, they shall give it an interim of four months. Afterwards, if they reconcile with them, then surely God is All Forgiving, All Merciful.