Prayer (Kitab Al-Salat): Detailed Injunctions about Witr
Dawud :: Book 8 : Hadith 1422
Narrated Ali ibn AbuTalib:
The Apostle of Allah (peace_be_upon_him) used to say at the end of his witr: "O Allah, I seek refuge in Thy good pleasure from Thy anger, and in Thy forgiveness from Thy punishment, and I seek refuge in Thy mercy from Thy wrath. I cannot reckon the praise due to Thee. Thou art as Thou hast praised Thyself."