Abu Salamah bin Abdur Rahman bin Awf (may Allah have mercy on him) says: I asked Sayyidah Aishah (may Allah be pleased with her): When the Prophet (peace and blessings be upon him) got up at night for prayer, with what would he begin the prayer? She said: When the Prophet (peace and blessings be upon him) got up at night, he would begin the prayer with these words: 'Allahumma Rabba Jibra'ila wa Mika'ila wa Israfil, fatiras-samawati wal-ard, 'alimal-ghaybi wash-shahadah, anta tahkumu bayna 'ibadika fima kanu fihi yakhtalifun, ihdini limakhtalafu fihi minal-haqqi bi-idhnik, innaka tahdi man tasha'u ila siratin mustaqim' (O Allah, Lord of Jibril, Mika'il and Israfil, Originator of the heavens and the earth, Knower of the unseen and the seen! You will judge between Your servants in that wherein they used to differ. O Allah! Guide me, by Your permission, to the truth in that wherein they differed. Indeed, You guide whom You will to a straight path [Surah al-Baqarah: 213]).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4668