Abu Dawud Book 2, Hadith Number 774.

Narated By AbuSa’id al-Khudri : When the Apostle of Allah (PBUH) got up to pray at night (for tahajjud prayer) he uttered the takbir and then said: “Glory be to Thee, O Allah,” and “Praise be to Thee” and “Blessed is Thy name,” and Exalted is Thy greatness.” and “There is no god but Thee.” He then said: “There is no god but Allah” three times; he then said: “Allah is altogether great” three times: “I seek refuge in Allah, All-Hearing and All-Knowing from the accursed devil, from his evil suggestion (hamz), from his puffing up (nafkh), and from his spitting (nafth)” He then recited (the Qur’an).