Sunan Ibn Majah
4031
Hasan+3

It was narrated from Anas bin Malik that the Messenger of Allah (ﷺ) said:“The greatest reward comes with the greatest trial. When Allah loves a people He tests them. Whoever accepts that wins His pleasure but whoever is discontent with that earns His wrath.”

HasanAl-Albani
HasanMuhammad Fouad Abd al-Baqi