"The Messenger of Allah ﷺ said: 'The man's water is thick and white, and the woman's water is thin and yellow. Whichever of them comes first, the child will resemble (that parent).'" (Using translation from Nasāʾī 200)  

قَالَ رَسُولُ اللهِ ﷺ «مَاءُ الرَّجُلِ غَلِيظٌ أَبْيَضُ وَمَاءُ الْمَرْأَةِ رَقِيقٌ أَصْفَرُ فَأَيُّهُمَا سَبَقَ كَانَ الشَّبَهُ»