Sahih al-Bukhari 5286
Narrated Ibn 'Abbas:
The pagans were of two kinds as regards their relationship to the 
     Prophet and the Believers. Some of them were those with whom the 
     Prophet was at war and used to fight against, and they used to fight 
     him; the others were those with whom the Prophet (ﷺ) made a treaty, and 
     neither did the Prophet (ﷺ) fight them, nor did they fight him. If a lady 
     from the first group of pagans emigrated towards the Muslims, her hand
     would not be asked in marriage unless she got the menses and then 
     became clean. When she became clean, it would be lawful for her to get
     married, and if her husband emigrated too before she got married, then
     she would be returned to him. If any slave or female slave emigrated 
     from them to the Muslims, then they would be considered free persons 
     (not slaves) and they would have the same rights as given to other 
     emigrants. The narrator then mentioned about the pagans involved with 
     the Muslims in a treaty, the same as occurs in Mujahid's narration. If
     a male slave or a female slave emigrated from such pagans as had made 
     a treaty with the Muslims, they would not be returned, but their 
     prices would be paid (to the pagans).
حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا هِشَامٌ، عَنِ ابْنِ جُرَيْجٍ، وَقَالَ، عَطَاءٌ عَنِ ابْنِ عَبَّاسٍ، كَانَ الْمُشْرِكُونَ عَلَى مَنْزِلَتَيْنِ مِنَ النَّبِيِّ صلى الله عليه وسلم وَالْمُؤْمِنِينَ، كَانُوا مُشْرِكِي أَهْلِ حَرْبٍ يُقَاتِلُهُمْ وَيُقَاتِلُونَهُ، وَمُشْرِكِي أَهْلِ عَهْدٍ لاَ يُقَاتِلُهُمْ وَلاَ يُقَاتِلُونَهُ، وَكَانَ إِذَا هَاجَرَتِ امْرَأَةٌ مِنْ أَهْلِ الْحَرْبِ لَمْ تُخْطَبْ حَتَّى تَحِيضَ وَتَطْهُرَ، فَإِذَا طَهُرَتْ حَلَّ لَهَا النِّكَاحُ، فَإِنْ هَاجَرَ زَوْجُهَا قَبْلَ أَنْ تَنْكِحَ رُدَّتْ إِلَيْهِ، وَإِنْ هَاجَرَ عَبْدٌ مِنْهُمْ أَوْ أَمَةٌ فَهُمَا حُرَّانِ وَلَهُمَا مَا لِلْمُهَاجِرِينَ‏.‏ ثُمَّ ذَكَرَ مِنْ أَهْلِ الْعَهْدِ مِثْلَ حَدِيثِ مُجَاهِدٍ وَإِنْ هَاجَرَ عَبْدٌ أَوْ أَمَةٌ لِلْمُشْرِكِينَ أَهْلِ الْعَهْدِ لَمْ يُرَدُّوا، وَرُدَّتْ أَثْمَانُهُمْ‏.‏