Narrated Ibn 'Abbas (RA):

A woman had accepted Islam and then re-married, so her (previous) husband came and said, "O Allah's Messenger (ﷺ) , I had accepted Islam and she knew that I had done so." So Allah's Messenger (ﷺ) took her away from her second husband and returned her to her first one. [Reported by Ahmad, Abu Dawud and Ibn Majah. Ibn Hibban and al-Hakim graded it Sahih (authentic)].

وَعَنِ ابْنِ عَبَّاسٍ ‏- رَضِيَ اَللَّهُ عَنْهُمَا‏- قَالَ : { أَسْلَمَتْ اِمْرَأَةٌ , فَتَزَوَّجَتْ , فَجَاءَ زَوْجُهَا , فَقَالَ : يَا رَسُولَ اَللَّهِ ! إِنِّي كُنْتُ أَسْلَمْتُ , وَعَلِمَتْ بِإِسْلَامِي , فَانْتَزَعَهَا رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-مِنْ زَوْجِهَا اَلْآخَرِ , وَرَدَّهَا إِلَى زَوْجِهَا اَلْأَوَّلِ } رَوَاهُ أَحْمَدُ , وَأَبُو دَاوُدَ , وَابْنُ مَاجَهْ .‏ وَصَحَّحَهُ اِبْنُ حِبَّانَ , وَالْحَاكِمُ [1]‏ .‏