Sahih al-Bukhari 6594

Zayd ibn Wahb related that 'Abdullah said, "The Messenger of Allah, may Allah bless him and grant him peace, who is the truthful confirmed one, said, 'The way that each of you is created is that you are gathered in your mother's womb for forty days and then for a similar length of time as a blood-clot and then for a similar length of time as a lump of flesh. Then Allah sends an angel and orders him to write four things: his provision, life-span, and whether he will be wretched or happy. By Allah, one of you (or a man) can do the actions of someone destined for the Fire until there is only an armspan between him and it, and then what is written will overtake him and he will do the actions of someone destined for the Garden and will enter it. A man can do the actions of someone destined for the Garden until there is only an armspan between him and it, and then what is written will overtake him and he will do the actions of someone destined for the Fire and will enter it." Adam said, "'Illa' instead of 'ghayr' in 'only an armspan.'"