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He said that when God’s Messenger was asked about withdrawing the penis he replied, “The child does not come from all the liquid, and when God intends to create anything nothing can prevent Him.” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْهُ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنِ الْعَزْلِ فَقَالَ: «مَا مِنْ كُلِّ الْمَاءِ يَكُونُ الْوَلَدُ وَإِذَا أَرَادَ اللَّهُ خَلْقَ شَيْءٍ لَمْ يَمْنَعْهُ شَيْءٌ» . رَوَاهُ مُسْلِمٌ
sunnah.com