مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1939
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas. The Messenger of Allah was commanded to prostrate on seven (parts) and was forbidden to tuck up his hair and garment.
Musnad Ahmad 1940Sahih (Darussalam) [ al-Bukhari (809) and Muslim (490)]