«اصنعوا ما بدا لكم فما قضى الله تعالى فهو كائن وليس من كل الماء يكون الولد»
The Prophet (peace and blessings be upon him) said:
"Do as you wish (that is, regarding coitus interruptus), but whatever Allah Almighty has decreed will come to be; and besides, a child does not come from every drop of water (sperm)."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 1016