The Prophet ﷺ used to say at the end of the witr prayer, "O Allah, 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 Your praise. You are as You have praised Yourself."
أن النبي ﷺ كان يقول في آخر الوتر: اللهم إني أعوذ برضاك من سخطك، وأعوذ بمعافاتك من عقوبتك، وأعوذ بك منك، لا أحصي ثناء عليك أنت كما أثنيت على نفسك.
Abu Dawud (1427), Tirmidhi (3561), Nasai (1748), Ibn Majah (1179), and Hakim (1/306) all narrated it through Hammad bin Salama, who said, Hisham bin Amr Fazari told me, from Abdul-Rahman bin Harith bin Hisham Makhzumi, from Ali bin Abu Talib, who mentioned it. Hakim said, "The isnad is sahih." I say, it is as he said, and its narrators are trustworthy. Hisham bin Amr Fazari is trustworthy, and he was deemed trustworthy by Ahmad, Ibn Main, Abu Hatim, and others.