Sunan Abi Dawud Book 5, Hadith 40
I heard the Messenger of Allah (ﷺ) say: Allah, the Exalted, says: Son of Adam, do not be helpless in performing four rak'ahs for Me at the beginning of the day: I will supply what you need till the end of it.
The Prophet (ﷺ) said: Prayer followed by a prayer with no idle talk between the two is recorded in Illiyyun.
The Messenger of Allah (ﷺ) prayed on the day of the Conquest (of Mecca) eight rak'ahs saluting after every two rak'ahs.
Abu Dawud said: Ahmad b. Salih said that the Messenger of Allah offered prayer in the forenoon on the day of the Conquest of Mecca, and he narrated something similar. Ibn al-Sarh reported that Umm Hani said: The Messenger of Allah (ﷺ) entered upon me. This version does not mention the prayer in the forenoon.