Sahih Muslim 1439a
Jabir (Allah be pleased with him) reported that a man came to Messenger of Allah ﷺ and said: I have a slave-girl who is our servant and she carries water for us and I have intercourse with her, but I do not want her to conceive. He said: Practise 'azl, if you so like, but what is decreed for her will come to her. The person stayed back (for some time) and then came and said: The girl has become pregnant, whereupon he said: I told you what was decreed for her would come to her.
حَدَّثَنَا أَحْمَدُ بْنُ عَبْدِ اللَّهِ بْنِ يُونُسَ، حَدَّثَنَا زُهَيْرٌ، أَخْبَرَنَا أَبُو الزُّبَيْرِ، عَنْ جَابِرٍ، أَنَّ رَجُلاً، أَتَى رَسُولَ اللَّهِ ﷺ فَقَالَ إِنَّ لِي جَارِيَةً هِيَ خَادِمُنَا وَسَانِيَتُنَا وَأَنَا أَطُوفُ عَلَيْهَا وَأَنَا أَكْرَهُ أَنْ تَحْمِلَ . فَقَالَ " اعْزِلْ عَنْهَا إِنْ شِئْتَ فَإِنَّهُ سَيَأْتِيهَا مَا قُدِّرَ لَهَا " . فَلَبِثَ الرَّجُلُ ثُمَّ أَتَاهُ فَقَالَ إِنَّ الْجَارِيَةَ قَدْ حَبِلَتْ . فَقَالَ " قَدْ أَخْبَرْتُكَ أَنَّهُ سَيَأْتِيهَا مَا قُدِّرَ لَهَا " .