Question: Is it permissible for a person who gets up Junub (person in a state of major ritual impurity) to observe Sawm (Fast) What was reported from the Prophet (peace be upon him) in this regard?
Answer: It is permissible for a person to intend Sawm while he is Junub, and he can take Janaabah Ghusl (full ritual bath to cleanse of sexual discharge) afterwards. It was reported that the Prophet (peace be upon him) would sometimes get up at the appointed time of Fajr (Dawn) Prayer while he was Junub and would intend Sawm, and then perform Ghusl... read more here.
Question: A young man committed the sin of Zinaa (sexual intercourse outside marriage) two hours before the Fajr (Dawn) Prayer. He could not perform Janaabah Ghusl (full ritual bath to cleanse of sexual discharge), but he had Suhoor (pre-dawn meal before the Fast) and intended to observe Sawm (Fast). Three hours and a half before the Thuhr (Noon) Prayer, he performed the Janaabah Ghusl. What is the ruling on his Sawm?
Answer: There is no doubt that Zinaa is major act of disobedience and an abominable sin. Allaah (Exalted be He) says: And come not near to unlawful sex. Verily, it is a Faahishah (i.e. anything that transgresses its limits: a great sin), and an evil way (that leads one to Hell unless Allaah forgives him).... read more here.