Muwatta Malik, Book 42, Hadith 1550 (In-Book)

Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, said "Whoever drinks wine in this world and does not turn from it in tawba, it is haram for him in the Next World."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ مَنْ شَرِبَ الْخَمْرَ فِي الدُّنْيَا ثُمَّ لَمْ يَتُبْ مِنْهَا حُرِمَهَا فِي الآخِرَةِ ‏" ‏ ‏.‏

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also referenced under: Book 42, Hadith 11 (USC-MSA)