Al-Baqarah 2:226

لِّلَّذِينَ يُؤۡلُونَ مِن نِّسَآئِهِمۡ تَرَبُّصُ أَرۡبَعَةِ أَشۡهُرٖۖ فَإِن فَآءُو فَإِنَّ ٱللَّهَ غَفُورٞ رَّحِيمٞ 226

For those who swear not to have sexual relations with their wives is a waiting time of four months, but if they return [to normal relations] - then indeed, Allah is Forgiving and Merciful