مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2950
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) or from al-Fadl bin Abbas (رضي الله عنه), or by one of them from the other, that he said: The Prophet (ﷺ) said: "Whoever wants to do Haji, let him hasten to do it for he may lose his mount or he may fall sick or be faced with some need.”
Musnad Ahmad 2973A saheeh hadeeth; this is a da'eef isnad]