[Machine] Abdullah passed by the Messenger of Allah ﷺ and people began to say, "This is the Messenger of Allah." A Jew then said, "If he is the Messenger of Allah, I will ask him about something. If he is a prophet, he will know the answer." So he said, "O Abu Al-Qasim, tell me: is the child created from the man's semen or the woman's semen?" The Messenger of Allah ﷺ replied, "Indeed, the man's semen is white and thick, from which the bones and nerves are formed, and the woman's semen is yellow and thin, from which the blood and flesh are formed."  

عَبْدُ اللهِ مَرَّ رَسُولُ اللهِ ﷺ فَجَعَلَ النَّاسُ يَقُولُونَ هَذَا رَسُولُ اللهِ فَقَالَ يَهُودِيٌّ إِنْ كَانَ رَسُولَ اللهِ فَسَأَسْأَلُهُ عَنْ شَيْءٍ فَإِنْ كَانَ نَبِيًّا عَلِمَهُ فَقَالَ يَا أَبَا الْقَاسِمِ أَخْبِرْنِي أَمِنْ نُطْفَةِ الرَّجُلِ يُخْلَقُ الْإِنْسَانُ أَوْ مِنْ نُطْفَةِ الْمَرْأَةِ؟ فَقَالَ «إِنَّ نُطْفَةَ الرَّجُلِ بَيْضَاءُ غَلِيظَةٌ فَمِنْهَا يَكُونُ الْعِظَامُ وَالْعَصَبُ وَإِنَّ نُطْفَةَ الْمَرْأَةِ صَفْرَاءُ رُقَيْقَةٌ فَمِنْهَا يَكُونُ الدَّمُ وَاللَّحْمُ»