(from the companions of Messenger of Allah ﷺ) When Suhail bin ʿAmr agreed to the Treaty (of Hudaibiya), one of the things he stipulated then, was that the Prophet ﷺ should return to them (i.e. the pagans) anyone coming to him from their side, even if he was a Muslim; and would not interfere between them and that person. The Muslims did not like this condition and got disgusted with it. Suhail did not agree except with that condition. So, the Prophet ﷺ agreed to that condition and returned Abu Jandal to his father Suhail bin ʿAmr. Thenceforward the Prophet ﷺ returned everyone in that period (of truce) even if he was a Muslim. During that period some believing women emigrants including Um Kulthum bint ʿUqba bin Abu Muait who came to Messenger of Allah ﷺ and she was a young lady then. Her relative came to the Prophet ﷺ and asked him to return her, but the Prophet ﷺ did not return her to them for Allah had revealed the following Verse regarding women: "O you who believe! When the believing women come to you as emigrants. Examine them, Allah knows best as to their belief, then if you know them for true believers, Send them not back to the unbelievers, (for) they are not lawful (wives) for the disbelievers, Nor are the unbelievers lawful (husbands) for them (60.10) (Using translation from Bukhārī 2711)
أَنَّهُ سَمِعَ مَرْوَانَ بْنَ الْحَكَمِ وَالْمِسْوَرَ بْنَ مَخْرَمَةَ يُخْبِرَانِ خَبَرًا مِنْ خَبَرِ رَسُولِ اللهِ ﷺ مِنْ غَزْوَةِ الْحُدَيْبِيَةِ فَكَانَ فِيمَا أَخْبَرَنِي عُرْوَةُ عَنْهُمَا أَنَّهُ لَمَّا كَاتَبَ رَسُولُ اللهِ ﷺ سُهَيْلَ بْنَ عَمْرٍو يَوْمَ الْحُدَيْبِيَةِ عَلَى قَضِيَّةِ الْمُدَّةِ كَانَ فِيمَا اشْتَرَطَ سُهَيْلُ بْنُ عَمْرٍو أَنَّهُ لَا يَأْتِيكَ مِنَّا أَحَدٌ وَإِنْ كَانَ عَلَى دِينِكَ إِلَّا رَدَدْتَهُ إِلَيْنَا وَخَلَّيْتَ بَيْنَنَا وَبَيْنَهُ وَأَبَى سُهَيْلٌ أَنْ يُقَاضِيَ رَسُولَ اللهِ ﷺ إِلَّا عَلَى ذَلِكَ فَكَرِهَ الْمُؤْمِنُونَ ذَلِكَ وَأَلْغَطُوا فِيهِ وَتَكَلَّمُوا فِيهِ فَلَمَّا أَبَى سُهَيْلٌ أَنْ يُقَاضِيَ رَسُولَ اللهِ ﷺ إِلَّا عَلَى ذَلِكَ كَاتَبَهُ رَسُولُ اللهِ ﷺ فَرَدَّ أَبَا جَنْدَلِ بْنَ سُهَيْلٍ يَوْمَئِذٍ إِلَى أَبِيهِ سُهَيْلِ بْنِ عَمْرٍو وَلَمْ يَأْتِ رَسُولُ اللهِ ﷺ أَحَدٌ مِنَ الرِّجَالِ إِلَّا رَدَّ فِي تِلْكَ الْمُدَّةِ وَإِنْ كَانَ مُسْلِمًا ثُمَّ جَاءَتِ الْمُؤْمِنَاتُ مُهَاجِرَاتٍ وَكَانَتْ أُمُّ كُلْثُومِ بِنْتُ عُقْبَةَ بْنِ أَبِي مُعَيْطٍ مِمَّنْ هَاجَرَتْ إِلَى رَسُولِ اللهِ ﷺ وَهِيَ عَاتِقٌ فَجَاءَ أَهْلُهَا يَسْأَلُونَ رَسُولَ اللهِ ﷺ أَنْ يُرْجِعَهَا إِلَيْهِمْ حَتَّى أَنْزَلَ اللهُ فِي الْمُؤْمِنَاتِ مَا أَنْزَلَ