Prayer (Kitab Al-Salat): Detailed Injunctions about Witr
Dawud :: Book 8 : Hadith 1534
Narrated Umar ibn al-Khattab:
The Prophet (peace_be_upon_him) used to seek refuge in Allah from five things; cowardliness, niggardliness, the evils of old age, evil thoughts, and punishment in the grave.