The two shall never separate from each other until they come...
The two shall never separate from each other until they come to me by the Pool (of Paradise)." Then the Messenger of Allah continued: "Do I not have more right over the believers than what they have over themselves?" People cried and answered: "Yes, O' Messenger of God." Then Prophet (PBUH) held up the hand of Ali and said: "Whoever I am his leader (Mawla), Ali is his leader (Mawla).
O' God, love those who love him, and be hostile to those who are hostile to him." Ghadir Khum (Part 1 of 3) (1) Sahih Tirmidhi, v2, p298, v5, p63 (2) Sunan Ibn Maja, v1, pp 12,43 (3) Khasa'is, by al-Nisa'i, pp 4,21 (4) al-Mustadrak, by al-Hakim, v2, p129, v3, pp 109-110,116,371 (5) Musnad Ahmad Ibn Hanbal, v1, pp 84,118,119,152,330, v4, pp 281,368,370, 372,378, v5, pp 35,347,358,361,366,419 (from 40 chains of narrators) (6) Fada'il al-Sahaba, by Ahmad Hanbal, v2, pp 563,572 (7) Majma' al-Zawa'id, by al-Haythami, v9, p103 (from several transmitters) (8) Tafsir al-Kabir, by Fakhr al-Razi, v12, pp 49-50 (9) Tafsir al-Durr al-Manthur, by al-Hafiz Jalaluddin al-Suyuti, v3, p19 (10) Tarikh al-Khulafa, by al-Suyuti, pp 169,173 (11) al-Bidayah wal-Nihayah, by Ibn Kathir, v3, p213, v5, p208 (12) Usdul Ghabah, by Ibn Athir, v4, p114 (13) Mushkil al-Athar, by al-Tahawi, v2, pp 307-308 (14) Habib al-Siyar, by Mir Khand, v1, part 3, p144 (15) Sawaiq al-Muhriqah, by Ibn Hajar al-Haythami, p26 (16) al-Isabah, by Ibn Hajar al-Asqalani, v2, p509; v1, part1, p319, v2, part1, p57, v3, part1, p29, v4, part 1, pp 14,16,143 (17) Tabarani, who narrated from companions such as Ibn Umar, Malik Ibn al-Hawirath, Habashi Ibn Junadah, Jari, Sa'd Ibn Abi Waqqas, Anas Ibn Malik, Ibn Abbas, Amarah,Buraydah,...
(18) Tarikh, by al-Khatib Baghdadi, v8, p290 (19) Hilyatul Awliya', by al-Hafiz Abu Nu'aym, v4, p23, v5, pp26-27 (20) al-Istiab, by Ibn Abd al-Barr, Chapter of word "ayn" (Ali), v2, p462 (21) Kanzul Ummal, by al-Muttaqi al-Hindi, v6, pp 154,397 (22) al-Mirqat, v5, p568 (23) al-Riyad al-Nadirah, by al-Muhib al-Tabari, v2, p172 (24) Dhaka'ir al-Uqba, by al-Muhib al-Tabari, p68 (25) Faydh al-Qadir, by al-Manawi, v6, p217 (26) Yanabi' al-Mawaddah, by al-Qudoozi al-Hanafi, p297 ... And hundreds more.
Please see part 3 for more classified references (traditionists, historians, and commentators). The above was just a part of speech of the Prophet (PBUH&HF). For a more detailed speech of the Prophet, please see the end of this part.