Yahya related to me from Malik from Yahya ibn Said from Muhammadibn Yahya ibn Habban from Ibn Muhayriz that a man from the Kinanatribe called al-Mukhdaji heard a man in Syria known as Abu Muhammadsaying, "The witr is obligatory (fard)." Al-Mukhdaji said, "I went toUbada ibn as-Samit and presented myself to him as he was going to themosque, and told him what Abu Muhammad had said. Ubada said that AbuMuhammad had lied and that he had heard the Messenger of Allah, mayAllah bless him and grant him peace, say, 'Allah the Majestic andMighty has written five prayers for mankind, and whoever does them anddoes not waste anything of them by making light of what is due tothem, there is a pact for him with Allah that He will admit him intothe Garden.Whoever does not do them, there is no pact for him withAllah. If He wishes, He punishes him, and if He wishes, He admits himinto the Garden.' "
App reference: Book 7, Hadith 14
USC-MSA web (English) reference: Book 7, Hadith 14
Arabic reference: Book 7, Hadith 268