مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2813
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) entered the Ka’bah, in which there were six pillars. He stood by each pillar and offered supplication (du’a), but he did not offer the prayer (salah) in it.
Musnad Ahmad 2833Its isnad is saheeh, Muslim (1331)]