Abdullah bin Umar reported,

Once four months have passed, he is to be detained until he divorces her, and the divorce does not take effect upon him until he pronounces it. This is reported from Uthman, Ali, Abu Darda, Ayesha, and twelve men from the Companions of the Prophet ﷺ.

Bukhari 5291

Sahih

و قال لي إسماعيل حدثني مالك عن نافع

عن ابن عمر

إذا مضت أربعة أشهر يوقف حتى يطلق ولا يقع عليه الطلاق حتى يطلق ويذكر ذلك عن عثمان وعلي وأبي الدرداء وعائشة واثني عشر رجلا من أصحاب النبي ﷺ

البخاري 5291صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Divorce
Chapter
Saying of Allah the Exalted, "For those who swear not to have relations with their wives is a waiting period of four months" to His saying, "Hearing, Knowing." "If they return" means they came back
Numbering
Darussalam 5291
Bukhari 5291