Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Agharr Muzani (may Allah be pleased with him) that a man came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, morning has come and I have not performed the Witr prayer. The Prophet (peace and blessings be upon him) said: "Witr is the prayer of the night." He said: O Messenger of Allah, morning has come and I have not performed the Witr prayer (what should I do now?). The Prophet (peace and blessings be upon him) said: "Perform the Witr prayer."