مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2444
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: 'Umar came to the Prophet (ﷺ) when he was in a storage room of his and said: Peace be upon you, O Messenger of Allah, peace be upon you, may ‘Umar come in?
Musnad Ahmad 2456Its isnad is saheeh]