مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3317
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas and al-Fadl, or one of them from the other, that he said: The Messenger of Allah (ﷺ) said: "whoever wants to do Hajj, let him hasten to do it, for he may fall sick, or he may lose his mount, or he may be faced with some need.”
Musnad Ahmad 3340A saheeh hadeeth; this is a da’eef isnad]