Sunan Abi Dawud Book 5, Hadith 44
The Messenger of Allah (ﷺ) never offered prayer in the forenoon, but I offer it. The Messenger of Allah (ﷺ) would give up an action, though he liked it to do, lest the people should continue it and it is prescribed for them.
I asked 'Aishah: Did the Messenger of Allah (ﷺ) pray in the Duha? She replied: No, except when he returned from his journey. I then asked: Did the Messenger of Allah (ﷺ) recite the surahs combining each other? She said: He would do so in the mufassal surahs.
I asked Jabir b. Samurah: Did you sit in the company of the Messenger of Allah (ﷺ) ? He replied: Yes, very often. He would not stand from the place he prayed the dawn prayer till the sunrise. When the sun rose, he would stand (to pray Duha).