Sahih Bukhari Volume 7, Book 67, Hadith 5212

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ أَسْمَاءَ، حَدَّثَنَا جُوَيْرِيَةُ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنِ الزُّهْرِيِّ، عَنِ ابْنِ مُحَيْرِيزٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ أَصَبْنَا سَبْيًا فَكُنَّا نَعْزِلُ فَسَأَلْنَا رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ أَوَإِنَّكُمْ لَتَفْعَلُونَ قَالَهَا ثَلاَثًا مَا مِنْ نَسَمَةٍ كَائِنَةٍ إِلَى يَوْمِ الْقِيَامَةِ إِلاَّ هِيَ كَائِنَةٌ ‏"‏‏

Narrated By Abu Said Al-Khudri : We got female captives in the war booty and we used to do coitus interruptus with them. So we asked Allah's Apostle 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."