Narrated Nafi':
Ibn 'Umar said, "While the Prophet was on the pulpit, a man asked him how to offer the night prayers. He replied, 'Pray two Rakat at a time and then two and then two and so on, and if you are afraid of...
I am here at Your service, O Allah, I am here at Your service. I am here at Your service, You have no partner, I am here at Your service. Surely the praise, and blessings are Yours, and the dominion. You have no partner.
Info: Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 3/408, Muslim 2/841.