Dua When Starting Tahajjud Prayer

اَللَّهُمَّ رَبَّ جِبْرَائِيْلَ وَمِيْكَائِيْلَ وَإِسْرَافِيلَ فَاطِرَ السَّمَوَاتِ وَالْأَرْضِ عَالِمَ الْغَيْبِ وَالشَّهَادَةِ أَنْتَ تَحْكُمُ بَيْنَ عِبَادِكَ فِيمَا كَانُوا فِيهِ يَخْتَلِفُونَ اِهْدِنِيْ لِمَا اخْتُلِفَ فِيهِ مِنَ الْحَقِّ بِإِذْنِكَ إِنَّكَ تَهْدِيْ مَنْ تَشَاءُ إِلَى صِرَاطٍ مُسْتَقِيْمٍ

Transliteration

Allaahumma rabba jibraa-eel, wameekaa-eel, wa-israafeel faatiras-samawaati wal-ardi, ‘Aalimal-ghaybi wash-shahadati, anta tahkumu bayna ‘ibaadika feemaa kaanoo feehi yakhtalifoon. ihdinee limakh-tulifa feehi minal-haqqi bi-idhnika, innaka tahdee man tasha-o ilaa siratin mustaqeem

Meaning

O Allah, Lord of Jibra-eel, Meeka-eel and Israfeel (great angles), Creator of the heavens and the Earth, Knower of the seen and the unseen. You are the arbitrator between Your servants in that which they have disputed. Guide me to the truth by Your leave, in that which they have differed, for verily You guide whom You will to a straight path.

Source: Muslim: 770