that the Messenger of Allah (ﷺ) said: Whoever calls to guidance, then he receives the reward similar to the reward of whoever follows him, without that diminishing anything from their rewards. And whoever calls to misguidance, then he receives of sin similar to the sins of those who followed him, without that diminishing anything from their sins.

from his father that the Messenger of Allah (ﷺ) said: Whoever starts a good tradition which is followed, then for him is a reward, and the likes of their rewards of whoever follows him, there being nothing diminished from their rewards. And whoever starts a bad tradition which is followed, then for him is the sin, and the likes of the sins of whoever follows him, there being nothing diminished from their sins.