جامع الترمذي

Narrated Abu Hurairah: "When the following was revealed: 'Whoever works evil will have the recompense of it... (4:123)' That worried the Muslims, so they complained about that to the Messenger of Allah (ﷺ) and he said: "Seek closeness and be steadfast, and in all that afflicts the believer there is atonement, even a thorn that pricks him, and the hardship he suffers."