Bukhari

Narrated Anas: I will narrate to you a narration which nobody will narrate to you after me. I heard that form the Prophet. I heard the Prophet saying, "The Hour sill not be established" or said: "From among the portents of the Hour is that the religious knowledge will betaken away (by the death of religious Scholars) and general ignorance (of religion) will appear; and the drinking of alcoholic drinks will be very common, and (open) illegal sexual intercourse will prevail, and men will decrease in number while women will increase so much so that, for fifty women there will only be one man to look after them."

And Allah the Exalted has said (in Surah Al-Furqan) «ولا يزنون‏» "And they do not commit adultery," and (in Surah Bani Isra'il) He said «ولا تقربوا الزنا إنه كان فاحشة وساء سبيلا‏» "And do not go near adultery; indeed, it is an immorality and an evil way."

And Allah the Exalted has said (in Surah Al-Furqan) «ولا يزنون‏» "And they do not commit adultery," and (in Surah Bani Isra'il) He said «ولا تقربوا الزنا إنه كان فاحشة وساء سبيلا‏» "And do not go near adultery; indeed, it is an immorality and an evil way."

Narrated Anas: I will narrate to you a narration which nobody will narrate to you after me. I heard that form the Prophet. I heard the Prophet saying, "The Hour sill not be established" or said: "From among the portents of the Hour is that the religious knowledge will betaken away (by the death of religious Scholars) and general ignorance (of religion) will appear; and the drinking of alcoholic drinks will be very common, and (open) illegal sexual intercourse will prevail, and men will decrease in number while women will increase so much so that, for fifty women there will only be one man to look after them."

Narrated 'Ikrima from Ibn 'Abbas: Allah's Apostles said, "When a slave (of Allah) commits illegal sexual intercourse, he is not a believer at the time of committing it; and if he steals, he is not a believer at the time of stealing; and if he drinks an alcoholic drink, when he is not a believer at the time of drinking it; and he is not a believer when he commits a murder," 'Ikrima said: I asked Ibn Abbas, "How is faith taken away from him?" He said, Like this," by clasping his hands and then separating them, and added, "But if he repents, faith returns to him like this, by clasping his hands again.

Narrated Abu Huraira: The Prophet said, "The one who commits an illegal sexual intercourse is not a believer at the time of committing illegal sexual intercourse and a thief is not a believer at the time of committing theft and a drinker of alcoholic drink is not a believer at the time of drinking. Yet, (the gate of) repentance is open thereafter."

Narrated `Abdullah bin Mas`ud: I said, "O Allah's Apostle! Which is the biggest sin?" He said, "To set up rivals to Allah by worshipping others though He alone has created you." I asked, "What is next?" He said, "To kill your child lest it should share your food." I asked, "What is next?" He said, "To commit illegal sexual intercourse with the wife of your neighbor."