Al-Baqarah 2:226

Lillatheena yu/loona min nisa-ihimtarabbusu arbaAAati ashhurin fa-in faoo fa-inna Allahaghafoorun raheem

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, Allāh is Forgiving and Merciful.

Those who swear to abstain from their wives have four months of waiting. Therefore, if they revert back, Allah is Most-Forgiving, Very-Merciful,