‏الصلاة : Hadeeth No:1637 Ibn 'Umar reported the Prophet of Allaah (sallAllaahu alayhi wa sallam) as say- ing: Hasten to pray Witr before morning....

‏الجهاد والسير‏ : Hadeeth No:4432 A similar tradition has been narrated through a different chain of transmitters by Ibn Shihab with the addition of the words:" Before Abdullah (b. Ubayy) became a Muslim."...