Al-Baqara 2:226

For those who swear not to have intercourse with their wives is a waiting period of four months. Should they then return [to each other], then Allah is All-Forgiving, Most Merciful.

For those who swear not to have sexual relations with their wives[85] is a waiting time of four months, but if they return [to normal relations] - then indeed, Allāh is Forgiving and Merciful.

[85] Without divorcing them. By such an oath the woman is deprived of her right in marriage but is not free to marry another. She may not be kept in such a condition beyond the four-month limit.

226. Those who take an oath[59] not to have sexual relation with their wives must wait for four months, then if they return (change their idea in this period), verily, Allâh is Oft-Forgiving, Most Merciful.

[59] (V.2:226) Narrated Nâfi‘: Ibn ‘Umar used to say about Al-’Îla’ (الإيلاء)* which Allâh defined (in the Holy Book), "If the period of Al-’Îla’ (الإيلاء) expires, then the husband has either to retain his wife in a handsome manner or to divorce her as Allâh [عز وجل] has ordered." Ibn ‘Umar added, "When the period of four months has expired, the husband should divorce his wife, but the divorce does not occur unless the husband himself declares it. This has been mentioned by ‘Uthmân, ‘Alî, Abu Ad-Dardâ’, ‘Âishah and twelve other Companions of the Prophet صلى الله عليه وسلم (Sahih Al-Bukhâri, Vol.7, Hadîth No. 213).
* Al-’Îla’ (الإيلاء): means the oath taken by a husband that he would not approach his wife for a certain period.

Those who forswear their wives must wait four months; then, if they change their mind, lo! Allah is Forgiving, Merciful.