A narrative from Sayyidna Anas RAA carried by al-Hakim in his al-Mustadrak says that when the Holy Prophet ﷺ left this mortal world, there came a person with a black and white beard. Tearing the crowd of people, he reached inside and started weeping. Then, turning to the noble Companions (Sahaba) he said:

"Indeed, in Allah there is endurance against all distress, and recompense for everything taken away, and He is the real caretaker for He alone survives after everyone is dead. So, return to Allah, turn to Him passionately and long for Him alone, and be mindful that He tests you by putting you in hardships. The person in real hardship is one who does not get any reward for his hardship."

Abstract from Ma'ariful Quran, Interpretation of Surah Al-Kahf, by Mufti Muhammad Shafi RE