I entered the Mosque and saw Abu Saʿid Al-Khudri and sat beside him and asked him about Al-Azl (i.e. coitus interruptus). Abu Saʿid said, "We went out with Messenger of Allah ﷺ for the Ghazwa of Banu Al-Mustaliq and we received captives from among the Arab captives and we desired women and celibacy became hard on us and we loved to do coitus interruptus. So when we intended to do coitus interrupt us, we said, 'How can we do coitus interruptus before asking Messenger of Allah ﷺ who is present among us?" We asked (him) about it and he said, 'It is better for you not to do so, for if any soul (till the Day of Resurrection) is predestined to exist, it will exist."  

أَنَّهُ قَالَ دَخَلْتُ الْمَسْجِدَ فَرَأَيْتُ أَبَا سَعِيدٍ الْخُدْرِيَّ فَجَلَسْتُ إِلَيْهِ فَسَأَلْتُهُ عَنِ الْعَزْلِ قَالَ أَبُو سَعِيدٍ خَرَجْنَا مَعَ رَسُولِ اللَّهِ ﷺ فِي غَزْوَةِ بَنِي الْمُصْطَلِقِ فَأَصَبْنَا سَبْيًا مِنْ سَبْىِ الْعَرَبِ فَاشْتَهَيْنَا النِّسَاءَ وَاشْتَدَّتْ عَلَيْنَا الْعُزْبَةُ وَأَحْبَبْنَا الْعَزْلَ فَأَرَدْنَا أَنْ نَعْزِلَ وَقُلْنَا نَعْزِلُ وَرَسُولُ اللَّهِ ﷺ بَيْنَ أَظْهُرِنَا قَبْلَ أَنْ نَسْأَلَهُ فَسَأَلْنَاهُ عَنْ ذَلِكَ فَقَالَ مَا عَلَيْكُمْ أَنْ لاَ تَفْعَلُوا مَا مِنْ نَسَمَةٍ كَائِنَةٍ إِلَى يَوْمِ الْقِيَامَةِ إِلاَّ وَهْىَ كَائِنَةٌ  

We got female captives in the war booty and we used to do coitus interruptus with them. So we asked Messenger of Allah ﷺ about it and he said, "Do you really do that?" repeating the question thrice, "There is no soul that is destined to exist but will come into existence, till the Day of Resurrection."  

أَصَبْنَا سَبْيًا فَكُنَّا نَعْزِلُ فَسَأَلْنَا رَسُولَ اللَّهِ ﷺ فَقَالَ أَوَإِنَّكُمْ لَتَفْعَلُونَ قَالَهَا ثَلاَثًا مَا مِنْ نَسَمَةٍ كَائِنَةٍ إِلَى يَوْمِ الْقِيَامَةِ إِلاَّ هِيَ كَائِنَةٌ