Muwatta Malik, Book 28, Hadith 1140 (In-Book) ⓘ

Yahya related to me from Malik that Ibn Shihab said, "Between the Islam of Safwan and the Islam of his wife there was about one month." Ibn Shihab said, "We have not heard about any woman doing hijra for Allah and His Messenger while her husband was a kafir abiding in the land of kufr, but that her hijra separated her and her husband unless her husband came in hijra before her period of idda had been completed."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، أَنَّهُ قَالَ كَانَ بَيْنَ إِسْلاَمِ صَفْوَانَ وَبَيْنَ إِسْلاَمِ امْرَأَتِهِ نَحْوٌ مِنْ شَهْرٍ ‏.‏ قَالَ ابْنُ شِهَابٍ وَلَمْ يَبْلُغْنَا أَنَّ امْرَأَةً هَاجَرَتْ إِلَى اللَّهِ وَرَسُولِهِ وَزَوْجُهَا كَافِرٌ مُقِيمٌ بِدَارِ الْكُفْرِ إِلاَّ فَرَّقَتْ هِجْرَتُهَا بَيْنَهَا وَبَيْنَ زَوْجِهَا إِلاَّ أَنْ يَقْدَمَ زَوْجُهَا مُهَاجِرًا قَبْلَ أَنْ تَنْقَضِيَ عِدَّتُهَا ‏.‏