مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2847
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “Hasten to do Hajj – i.e., the obligatory Hajj – for none of you knows what may happen to him.”
Musnad Ahmad 2867A hasan hadeeth; this is a da’eef isnad]