Sunan an-Nasa'i, Volume 4, Book 26, Hadith 3330 (DarusSalam) ⓘ
It was narrated from Abu Sa'eed Az-Zuraqi that a man asked the Messenger of Allah about coitus interruptus and said: "My wife is breast-feeding and I do not want her to get pregnant." The Prophet said: "What has been decreed in the womb will come to be."
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، عَنْ مُحَمَّدٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي الْفَيْضِ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ مُرَّةَ الزُّرَقِيَّ، عَنْ أَبِي سَعِيدٍ الزُّرَقِيِّ، أَنَّ رَجُلاً، سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الْعَزْلِ فَقَالَ إِنَّ امْرَأَتِي تُرْضِعُ وَأَنَا أَكْرَهُ أَنْ تَحْمِلَ . فَقَالَ النَّبِيُّ صلى الله عليه وسلم " إِنَّ مَا قَدْ قُدِّرَ فِي الرَّحِمِ سَيَكُونُ " .
also referenced under: Hadith 3328 (Reference) & Book 26, Hadith 133 (In-Book)