"The Messenger of Allah [SAW] said: 'The adulterer is not a believer at the moment when he is committing adultery, and the wine drinker is not a believer at the moment when he is drinking wine, and the thief is not a believer at the moment when he is stealing, and the robber is not a believer at the moment when he is robbing and people are looking on.'"
The Prophet [SAW] said: "The adulterer is not a believer at the moment when he is committing adultery, and the thief is not a believer at the moment when he is stealing, and the wine drinker is not a believer at the moment when he is drinking wine, and the robber is not a believer at the moment when he is robbing and taking something valuable by force while the Muslims are looking at it.'"
"The Messenger of Allah [SAW] said: 'Whoever drinks Khamr, whip him; then if he drinks (again), whip him; then if he drinks (again), whip him; then if he drinks (again), kill him.'"
The Messenger of Allah [SAW] said: "If he becomes drunk, whip him; then if he becomes drunk, whip him; then if he becomes drunk, whip him." Then he said concerning the fourth time, "Strike his neck (i.e., kill him)."
Ibn Ad-Dailami rode looking for 'Abdullah bin 'Amr bin Al-'As. Ibn Ad-Dailami said: "I entered upon him and said: 'O 'Abdullah bin 'Amr, did you hear the Messenger of Allah [SAW] say anything concerning Khamr?' He said: 'Yes, I heard the Messenger of Allah [SAW] say: If a man among my Ummah drinks Khamr, Allah will not accept his Salah for forty days.'"
"If a judge accepts a gift he has consumed something unlawful, and if he accepts a bribe, that takes him to the level of Kufr." Masruq said: "Whoever drinks Khamr, he has committed (an act of) Kufr, and his Kufr is that his Salah does not count."
"I heard 'Uthman, may Allah be pleased with him, say: 'Avoid Khamr for it is the mother of all evils. There was a man among those who came before you who was a devoted worshipper. An immoral woman fell in love with him. She sent her slave girl to him, saying: We are calling you to bear witness. So he set out with her slave girl, and every time he entered a door, she locked it behind him, until he reached a beautiful woman who has with her a boy and a vessel of wine. She said: 'By Allah, I did not call you to bear witness, rather I called you to have intercourse with me, or to drink a cup of this wine, or to kill this boy.' He said: 'Pour me a cup of this wine.' So she poured him a cup. He said: 'Give me more.' And soon he had intercourse with her and killed the boy. So avoid Khamr, for by Allah faith and addiction to Khamr cannot coexist but, one of them will soon expel the other."
"I heard 'Uthman say: 'Avoid Khamr for it is the mother of all evils. There was a man among those who came before you who was a devoted worshipper and used to stay away from people.'" And he mentioned something similar. He said: "Avoid Khamr for, by Allah, it can never coexist with Faith, but soon one of them will expel the other."
"Whoever drinks Khamr and does not get intoxicated, his Salah will not be accepted so long as any trace of it remains in his belly or his veins, and if he dies he will die a Kafir. If he becomes intoxicated his Salah will not be accepted for 40 nights, and if he dies during them, he will die a Kafir." (Sahih Mawquf)