On the authority of Abdullah ibn Masood (RA), who said:
The Messenger of Allah (ﷺ), and he is truthful, the believed, narrated to us, “Verily the creation of each one of you is brought together in his mother’s womb for forty days in the form of a nutfah (a drop), then he becomes an alaqah (clot of blood) for a like period, then a mudghah (a morsel of flesh) for a like period, then there is sent to him the angel who blows his soul into him and who is commanded with four matters: to write down his rizq (sustenance), his life span, his actions, and whether he will be happy or unhappy (i.e., whether or not he will enter Paradise). By the One, other than Whom there is no deity, verily one of you performs the actions of the people of Paradise until there is but an arms-length between him and it, and that which has been written overtakes him, and so he acts with the actions of the people of the Hellfire and thus enters it; and verily one of you performs the actions of the people of the Hellfire until there is but an arms-length between him and it, and that which has been written overtakes him and so he acts with the actions of the people of Paradise and thus he enters it.”
| Reference | : Hadith 4, 40 Hadith an-Nawawi |
