It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to recite this supplication at the end of Witr: "O Allah! Indeed, I seek refuge in Your pleasure from Your displeasure, and I seek refuge in Your pardon from Your punishment, and I seek refuge in You from You. I cannot enumerate praise of You; You are as You have praised Yourself." (O Allah! Indeed, I seek refuge in Your pleasure from Your displeasure, I seek refuge in Your pardon from Your punishment, and I seek refuge in You from You. I cannot enumerate praise of You; You are as You have praised Yourself.)
Hadith Referenceالفتح الربانی / أبواب الأذ كار الواردة عقب الصلاة / 1871