Narrated AbuSa'id al-Khudri: A man said: Apostle of Allah, I have a slave-girl and I withdraw the penis from her (while having intercourse), and I dislike that she becomes pregnant. I intend (by intercourse) what the men intend by it. The Jews say that withdrawing the penis (azl) is burying the living girls on a small scale. He (the Prophet) said: The Jews told a lie. If Allah intends to create it, you cannot turn it away.

Abu Dawud 11:2166