I asked 'A'isha, the mother of the believers, (to tell me) the words with which the Messenger of Allah ﷺ commenced the prayer when he got up at night. She said: When he got up at night he would commence his prayer with these words: O Allah, Lord of Gabriel, and Michael, and Israfil, the Creator of the heavens and the earth, Who knowest the unseen and the seen; Thou decidest amongst Thy servants concerning their differences. Guide me with Thy permission in the divergent views (which the people) hold about Truth, for it is Thou Who guidest whom Thou wilt to the Straight Path. (Using translation from Muslim 770)
سَأَلْتُ عَائِشَةَ أُمَّ الْمُؤْمِنِينَ بِأَيِّ شَيْءٍ كَانَ رَسُولُ اللهِ ﷺ يَفْتَتِحُ صَلَاتَهُ إِذَا قَامَ مِنَ اللَّيْلِ؟ قَالَتْ كَانَ إِذَا قَامَ كَبَّرَ وَيَقُولُ اللهُمَّ رَبَّ جِبْرِيلَ وَمِيكَائِيلَ وَإِسْرَافِيلَ فَاطِرَ السَّمَاوَاتِ وَالْأَرْضِ عَالِمَ الْغَيْبِ وَالشَّهَادَةِ أَنْتَ تَحْكُمُ بَيْنَ عِبَادِكَ فِيمَا كَانُوا فِيهِ يَخْتَلِفُونَ اهْدِنِي لِمَا اخْتَلَفْتُ فِيهِ مَنِ الْحَقِّ بِإِذْنِكَ إِنَّكَ تَهْدِي مَنْ تَشَاءُ إِلَى صِرَاطٍ مُسْتَقِيمٍ