It was narrated from Ali Ibn Abi Talib (RA) that the Prophet ﷺ SAW used to say at the end of Witr: "Allahurnma inni audhu bika biridaka min sakhatika, wa audhu bimuafatika min uqubatika, wa audhu bika minka, La uhsi thanaan alaika, Anta kama athnaita ala nafsika (O Allah, I seek refuge in Your pleasure from Your wrath, and I seek refuge in Your forgiveness from Your punishment, and I seek refuge in You from You. I cannot enumerate Your praise You are as You have praised Yourself)." (Sahih).