Ishaq bin Yusuf bin Mrdas إسحاق بن يوسف بن مرداس · The Book of the Sunnah

"A man from among the Ansar came to the Prophet (ﷺ) and said: 'O Messenger of Allah (ﷺ), I have a slave girl. Should I do 'Azl (coitus interruptus) with her?' He said 'Whatever is decreed for her shall come to her." He (the Ansari) came to him later on and said: "The slave girl has become pregnant." The Prophet (ﷺ) said: "Nothing is decreed for a person but it will surely come to pass."