(4) باب مَنْ أَجَازَ طَلاَقَ الثَّلاَثِ
Narrated `Aisha:
A man divorced his wife thrice (by expressing his decision to divorce her thrice), then she married another man who also divorced her. The Prophet (ﷺ) was asked if she could legally marry the first husband (or not). The Prophet (ﷺ) replied, "No, she cannot marry the first husband unless the second husband consummates his marriage with her, just as the first husband had done."
Reference: Sahih al-Bukhari 5261
In-book reference: Book 68, Hadith 11
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 63, Hadith 187