Musannaf Ibn Abi Shaybah 7030 — Those who said: witr is a sunnah

A man of Banu Kinanah named al-Mukhdaji reports that an Ansari Companion in Syria, Abu Muhammad (may Allah be pleased with him), used to say that witr is obligatory (wajib). Al-Mukhdaji said: This was mentioned before Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him), and Sayyiduna Ubadah said: "Abu Muhammad is mistaken. I heard the Messenger of Allah (peace and blessings be upon him) say: 'There are five prayers which Allah Almighty has made obligatory upon His servants. Whoever performs these prayers without falling short in their due, it is binding upon Allah Almighty to admit him into Paradise. Whoever falls short in the due of these prayers, Allah Almighty bears no responsibility for him: if He wills, He will punish him, and if He wills, He will admit him into Paradise.'"