Musannaf Ibn Abi Shayba 21:215

Zayd ibn al-Hubab narrated to us, from Malik ibn Anas, from Abu al-Zubayr, from Tawus, from Ibn Abbas, who said: When the Messenger of Allah (may Allah bless him and grant him peace) would perform the night prayer (tahajjud), he would say: "O Allah, to You is the praise; You are the light of the heavens and the earth and whoever is in them. To You is the praise; You are the Sustainer of the heavens and the earth. To You is the praise; You are the Lord of the heavens and the earth and whoever is in them. You are the Truth, Your word is the truth, Paradise is the truth, the Fire is the truth, and the Hour is the truth. O Allah, to You I have submitted, in You I have believed, upon You I have relied, to You I have turned in repentance, for Your sake I have contended, and to You I have brought my judgment. So forgive me for what I have sent forth and what I have delayed, what I have concealed and what I have declared, and what You know better than I do. You are the Advancer and the Delayer; there is no god but You."