Reference : Hisn al-Muslim 117

اللّهُـمَّ إِنِّـي أَعـوذُ بِرِضـاكَ مِنْ سَخَطِـك،
وَبِمُعـافاتِـكَ مِنْ عُقوبَـتِك،
وَأَعـوذُ بِكَ مِنْـك،
لا أُحْصـي ثَنـاءً عَلَـيْك،
أَنْـتَ كَمـا أَثْنَـيْتَ عَلـى نَفْسـِك
Allāhumma innī a`ūdhu biriḍāka min sakhaṭik, 
wa bimu`āfātika min `uqūbatik, 
wa a`ūdhu bika mink, 
lā uḥṣī thanā'an `alayk,
Anta kamā athnayta `alā nafsik.


O Allah, I seek refuge with Your Pleasure from Your anger. 
I seek refuge in Your forgiveness from Your punishment. 
I seek refuge in You from You. 
I cannot count Your praises, 
You are as You have praised Yourself.

Reference:
Abu Dawud, Ibn Majah, An-Nasa'i, At-Tirmidhi, Ahmad. See Al-Albani, Sahih 
At-Tirmidhi 3/180, Sahih Ibn Majah 1/194, and 'Irwa'ul-Ghalil. 2/ 175.

Chapter: Qunoot Al-Witr