Embryology

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، وَزُهَيْرُ بْنُ حَرْبٍ، - وَاللَّفْظُ لاِبْنِ نُمَيْرٍ - قَالاَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ أَبِي الطُّفَيْلِ، عَنْ حُذَيْفَةَ بْنِ أَسِيدٍ، يَبْلُغُ بِهِ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏ "‏ يَدْخُلُ الْمَلَكُ عَلَى النُّطْفَةِ بَعْدَ مَا تَسْتَقِرُّ فِي الرَّحِمِ بِأَرْبَعِينَ أَوْ خَمْسَةٍ وَأَرْبَعِينَ لَيْلَةً فَيَقُولُ يَا رَبِّ أَشَقِيٌّ أَوْ سَعِيدٌ فَيُكْتَبَانِ فَيَقُولُ أَىْ رَبِّ أَذَكَرٌ أَوْ أُنْثَى فَيُكْتَبَانِ وَيُكْتَبُ عَمَلُهُ وَأَثَرُهُ وَأَجَلُهُ وَرِزْقُهُ ثُمَّ تُطْوَى الصُّحُفُ فَلاَ يُزَادُ فِيهَا وَلاَ يُنْقَصُ ‏"‏ ‏.‏

Hudhaifa b. Usaid reported directly from Allah's Messenger (ﷺ) that he said: When the drop of (semen) remains in the womb for forty or forty five nights, the angel comes and says: My Lord, will he be good or evil? And both these things would be written. Then the angel says: My Lord, would he be male or female? And both these things are written. And his deeds and actions, his death, his livelihood; these are also recorded. Then his document of destiny is rolled and there is no addition to nor subtraction from it.

Sahih Muslim 2644 https://sunnah.com/muslim:2644

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حَدَّثَنِي أَبُو الطَّاهِرِ، أَحْمَدُ بْنُ عَمْرِو بْنِ سَرْحٍ أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي عَمْرُو، بْنُ الْحَارِثِ عَنْ أَبِي الزُّبَيْرِ الْمَكِّيِّ، أَنَّ عَامِرَ بْنَ وَاثِلَةَ، حَدَّثَهُ أَنَّهُ، سَمِعَ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ، يَقُولُ الشَّقِيُّ مَنْ شَقِيَ فِي بَطْنِ أُمِّهِ وَالسَّعِيدُ مَنْ وُعِظَ بِغَيْرِهِ ‏.‏ فَأَتَى رَجُلاً مِنْ أَصْحَابِ رَسُولِ اللَّهِ صلى الله عليه وسلم يُقَالُ لَهُ حُذَيْفَةُ بْنُ أَسِيدٍ الْغِفَارِيُّ فَحَدَّثَهُ بِذَلِكَ مِنْ قَوْلِ ابْنِ مَسْعُودٍ فَقَالَ وَكَيْفَ يَشْقَى رَجُلٌ بِغَيْرِ عَمَلٍ فَقَالَ لَهُ الرَّجُلُ أَتَعْجَبُ مِنْ ذَلِكَ فَإِنِّي سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ إِذَا مَرَّ بِالنُّطْفَةِ ثِنْتَانِ وَأَرْبَعُونَ لَيْلَةً بَعَثَ اللَّهُ إِلَيْهَا مَلَكًا فَصَوَّرَهَا وَخَلَقَ سَمْعَهَا وَبَصَرَهَا وَجِلْدَهَا وَلَحْمَهَا وَعِظَامَهَا ثُمَّ ‏.‏ قَالَ يَا رَبِّ أَذَكَرٌ أَمْ أُنْثَى فَيَقْضِي رَبُّكَ مَا شَاءَ وَيَكْتُبُ الْمَلَكُ ثُمَّ يَقُولُ يَا رَبِّ أَجَلُهُ ‏.‏ فَيَقُولُ رَبُّكَ مَا شَاءَ وَيَكْتُبُ الْمَلَكُ ثُمَّ يَقُولُ يَا رَبِّ رِزْقُهُ ‏.‏ فَيَقْضِي رَبُّكَ مَا شَاءَ وَيَكْتُبُ الْمَلَكُ ثُمَّ يَخْرُجُ الْمَلَكُ بِالصَّحِيفَةِ فِي يَدِهِ فَلاَ يَزِيدُ عَلَى مَا أُمِرَ وَلاَ يَنْقُصُ ‏"‏ ‏.‏

'Abdullah b. Mas'ud reported: Evil one is he who is evil in the womb of his mother and the good one is he who takes a lesson from the (fate of) others. The narrator came to a person from amongst the Companions of Allah's Messenger (ﷺ) who was called Hudhaifa b. Usaid Ghifari and said: How can a person be an evil one without (committing an evil) deed? Thereupon the person said to him: You are surprised at this, whereas I have heard Allah's Messenger (ﷺ) as saying: When forty-two nights pass after the semen gets into the womb, Allah sends the angel and gives him shape. Then he creates his sense of hearing, sense of sight, his skin, his flesh, his bones, and then says: My Lord, would he be male or female? And your Lord decides as He desires and the angel then puts down that also and then says: My Lord, what about his age? And your Lord decides as He likes it and the angel puts it down. Then he says: My Lord, what about his livelihood? And then the Lord decides as He likes and the angel writes it down, and then the angel gets out with his scroll of destiny in his hand and nothing is added to it and nothing is subtracted from it.

Sahih Muslim 2645a https://sunnah.com/muslim:2645a

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حَدَّثَنِي مُحَمَّدُ بْنُ أَحْمَدَ بْنِ أَبِي خَلَفٍ، حَدَّثَنَا يَحْيَى بْنُ أَبِي بُكَيْرٍ، حَدَّثَنَا زُهَيْرٌ أَبُو خَيْثَمَةَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ عَطَاءٍ، أَنَّ عِكْرِمَةَ بْنَ خَالِدٍ، حَدَّثَهُ أَنَّ أَبَا الطُّفَيْلِ حَدَّثَهُ قَالَ دَخَلْتُ عَلَى أَبِي سَرِيحَةَ حُذَيْفَةَ بْنِ أَسِيدٍ الْغِفَارِيِّ فَقَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم بِأُذُنَىَّ هَاتَيْنِ يَقُولُ ‏"‏ إِنَّ النُّطْفَةَ تَقَعُ فِي الرَّحِمِ أَرْبَعِينَ لَيْلَةً ثُمَّ يَتَصَوَّرُ عَلَيْهَا الْمَلَكُ ‏"‏ ‏.‏ قَالَ زُهَيْرٌ حَسِبْتُهُ قَالَ الَّذِي يَخْلُقُهَا ‏"‏ فَيَقُولُ يَا رَبِّ أَذَكَرٌ أَوْ أُنْثَى فَيَجْعَلُهُ اللَّهُ ذَكَرًا أَوْ أُنْثَى ثُمَّ يَقُولُ يَا رَبِّ أَسَوِيٌّ أَوْ غَيْرُ سَوِيٍّ فَيَجْعَلُهُ اللَّهُ سَوِيًّا أَوْ غَيْرَ سَوِيٍّ ثُمَّ يَقُولُ يَا رَبِّ مَا رِزْقُهُ مَا أَجَلُهُ مَا خُلُقُهُ ثُمَّ يَجْعَلُهُ اللَّهُ شَقِيًّا أَوْ سَعِيدًا ‏"‏ ‏.‏

Abu Tufail reported: I visited Abu Sariha Hudhaifa b. Usaid al-Ghifari who said: I listened with these two ears of mine Allahs Messenger (ﷺ) as saying: The semen stays in the womb for forty nights, then the angel, gives it a shape. Zubair said: I think that he said: One who fashions that and decides whether he would be male or female. Then he (the angel) says: Would his limbs be full or imperfect? And then the Lord makes thein full and perfect or otherwise as He desires. Then he says: My Lord, what about his livelihood, and his death and what about his disposition? And then the Lord decides about his misfortune and fortune.

Sahih Muslim 2645c https://sunnah.com/muslim:2645c