مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2895
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “I have been commanded to (pray) the two ruk'ahs of Duha, but you are not enjoined to do it, I have been commanded to offer the sacrifice (adha) but it was not enjoined."
Musnad Ahmad 2916lts isnad is da'eef]