Abdullah bin Masud reported,

The Messenger of Allah ﷺ said, "I will go ahead of you to the pool, and I will contend over certain people, but they will be taken from me. I will say, 'My Lord, my companions, my companions!' and it will be said, 'You do not know what they did after you were gone.'"He did not mention "my companions, my companions."

Muslim 5979

Sahih

و حدثناه عثمان بن أبي شيبة وإسحق بن إبراهيم عن جرير عن الأعمش بهذا الإسناد ولم يذكر أصحابي أصحابي

مسلم 5979صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Virtues
Chapter
Affirmation of the cistern of our Prophet ﷺ and its attributes
Numbering
Darussalam 5979
Muslim 5979