مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1964
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn "Abbas that the Messenger of Allah (ﷺ) prayed in an open space with nothing in front of him.
Musnad Ahmad 1965Hasan because of corroborating evidence] .