Hadith: Mention was made of coitus interruptus in the presence of the Messenger of Allah (may Allah's peace and blessings be upon him) whereupon he said: Why would anyone of you do that? Verily, no soul is ordained to be created but Allah will create it

عن أبي سعيد الخدري رضي الله عنه : «ذُكِرَ َالعزل لرسول الله صلى الله عليه وسلم فقال: ولم يفعل ذلك أحدكم؟ -ولم يقل: فلا يفعل ذلك أحدكم؟-؛ فإنه ليست نفس مخلوقة إلا الله خالقها».
[صحيح] - [متفق عليه]

Abu Sa‘īd al-Khudri (may Allah be pleased with him) reported that mention was made of coitus interruptus in the presence of the Messenger of Allah (may Allah's peace and blessings be upon him) whereupon he said: "Why would anyone of you do that? (He did not say: 'No one should do that') Verily, no soul is ordained to be created but Allah will create it."
Sahih/Authentic. - [Al-Bukhari and Muslim]

Explanation

Mention was made of coitus interruptus in the presence of the Messenger of Allah (may Allah's peace and blessings be upon him) and that some men practiced it with their wives and their slave women. So, the Prophet (may Allah's peace and blessings be upon him) asked them in a reproachful tone about the reason for doing that. Then, he responded to their purpose for doing such a practice by a convincing answer that urges them to stop it. He told them that Allah, the Almighty, has already passed the Divine Decrees, and such a practice would never prevent the creation of a soul that Allah ordained to be created and exist. This is because Allah is the Creator of the causes and the results. If Allah wanted to create a sperm-drop (soul) from the man's semen, it would unconsciously move to its firm lodging.