It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that he said: "I saw the Prophet (peace and blessings be upon him) on his mount on the Day of Sacrifice (Yawm al-Nahr), and he (peace and blessings be upon him) was saying: 'My Ummah should learn its rites (the manner of performing Hajj), for I do not know; perhaps I will not perform Hajj after this year of mine.'"