Sahih al-Bukhari 7454
Narrated `Abdullah bin Mas`ud:
Allah's Messenger (ﷺ) the true and truly inspired, narrated to us, "The creation of everyone of you starts with 
the process of collecting the material for his body within forty days and forty nights in the womb of 
his mother. Then he becomes a clot of thick blood for a similar period (40 days) and then he becomes 
like a piece of flesh for a similar period. Then an angel is sent to him (by Allah) and the angel is 
allowed (ordered) to write four things; his livelihood, his (date of) death, his deeds, and whether he 
will be a wretched one or a blessed one (in the Hereafter) and then the soul is breathed into him. So 
one of you may do (good) deeds characteristic of the people of Paradise so much that there is nothing 
except a cubit between him and Paradise but then what has been written for him decides his behavior 
and he starts doing (evil) deeds characteristic of the people of Hell (Fire) and (ultimately) enters Hell 
(Fire); and one of you may do (evil) deeds characteristic of the people of Hell (Fire) so much so that 
there is nothing except a cubit between him and Hell (Fire), then what has been written for him 
decides his behavior and he starts doing (good) deeds characteristic of the people of Paradise and 
ultimately) enters Paradise." (See Hadith No. 430, Vol. 4)
حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا الأَعْمَشُ، سَمِعْتُ زَيْدَ بْنَ وَهْبٍ، سَمِعْتُ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ ـ رضى الله عنه ـ حَدَّثَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم وَهْوَ الصَّادِقُ الْمَصْدُوقُ ‏
"‏ إِنَّ خَلْقَ أَحَدِكُمْ يُجْمَعُ فِي بَطْنِ أُمِّهِ أَرْبَعِينَ يَوْمًا وَأَرْبَعِينَ لَيْلَةً، ثُمَّ يَكُونُ عَلَقَةً مِثْلَهُ، ثُمَّ يَكُونُ مُضْغَةً مِثْلَهُ، ثُمَّ يُبْعَثُ إِلَيْهِ الْمَلَكُ فَيُؤْذَنُ بِأَرْبَعِ كَلِمَاتٍ، فَيَكْتُبُ رِزْقَهُ وَأَجَلَهُ وَعَمَلَهُ وَشَقِيٌّ أَمْ سَعِيدٌ ثُمَّ يَنْفُخُ فِيهِ الرُّوحَ، فَإِنَّ أَحَدَكُمْ لَيَعْمَلُ بِعَمَلِ أَهْلِ الْجَنَّةِ، حَتَّى لاَ يَكُونُ بَيْنَهَا وَبَيْنَهُ إِلاَّ ذِرَاعٌ، فَيَسْبِقُ عَلَيْهِ الْكِتَابُ، فَيَعْمَلُ بِعَمَلِ أَهْلِ النَّارِ فَيَدْخُلُ النَّارَ، وَإِنَّ أَحَدَكُمْ لَيَعْمَلُ بِعَمَلِ أَهْلِ النَّارِ، حَتَّى مَا يَكُونُ بَيْنَهَا وَبَيْنَهُ إِلاَّ ذِرَاعٌ فَيَسْبِقُ عَلَيْهِ الْكِتَابُ، فَيَعْمَلُ عَمَلَ أَهْلِ الْجَنَّةِ فَيَدْخُلُهَا ‏"‏‏.‏