مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3318
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: A red velvet blanket was placed in the grave of the Messenger of Allah (ﷺ)
Musnad Ahmad 3341Its isnad is saheeh, Muslim (967)]