مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2757
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (رضي الله عنه) that the Messenger of Allah (ﷺ) said: “I have been commanded to prostrate on seven bones: the forehead, - and he pointed to his nose - the two hands, the two knees and the toes, and not to tuck up my garment or hair.”
Musnad Ahmad 2777Its isnad is saheeh, al-Bukhari (809) and Muslim (490)]