مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2319
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: I heard the Messenger of Allah (ﷺ) say: “I shall be ahead of you at the Cistern, and whoever comes to it will have succeeded. Some people will be brought and then taken to the left, and I will say: 'O Lord!' But it will be said: ‘They continued turning back on their heels after you were gone.”’
Musnad Ahmad 2327A saheeh hadeeth; al-Bukhari (3349) and Muslim (2860) and th