It is narrated from Sayyiduna Zayd bin Arqam (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) returned from the Farewell Pilgrimage and halted at the place called Ghadir Khumm, he (peace and blessings be upon him) gave orders concerning some large, shady trees, and the ground beneath them was cleared. Then he (peace and blessings be upon him) said: "It seems to me that I will soon be called (by my Lord) and I shall respond. I am leaving among you two weighty things (al-thaqalayn), one of which is greater than the other: the Book of Allah Almighty and my family ('itrah, the Ahl al-Bayt). So see how you treat these two after me, for they will never separate from one another until they come to me at the Pond (al-Kawthar)." Then he (peace and blessings be upon him) said: "Indeed, Allah, the Mighty and Majestic, is my Master (Mawla), and I am the guardian (wali) of every believer." Then he (peace and blessings be upon him) took hold of the hand of Sayyiduna Ali (may Allah be pleased with him) and said: "Whoever I am the wali (friend and patron) of, then this one (Ali) is his wali. 'Allahumma wali man walahu, wa 'adi man 'adahu' (O Allah! Befriend whoever befriends him, and be hostile to whoever is hostile to him)." And after that the narrator mentioned the lengthy hadith. This hadith is sahih (authentic) on the condition of Imam Bukhari and Imam Muslim, but they did not record it at this length. The narration of Salamah bin Kuhayl from Abu al-Tufayl, which is a supporting witness (shahid) for this hadith, is also sahih on the condition of the two of them: