Surah Al-Baqarah (The Cow), Verse 226

لِلَّذِیْنَ یُؤْلُوْنَ مِنْ نِّسَآىِٕهِمْ تَرَبُّصُ اَرْبَعَةِ اَشْهُرٍ فَاِنْ فَآءُوْ فَاِنَّ اللّٰهَ غَفُوْرٌ رَّحِیْمٌ ۟

Lillazeena yu'loona min nisaaa'ihim tarabbusu arba'ati ashhurin fain faaa'oo fa innal laaha Ghafoorur Raheem

“For those who take an oath for abstention from their wives, a waiting for four months is ordained; if then they return, Allah is Oft-forgiving, Most Merciful.”

Quran 2:226 (Yusuf Ali Translation)