(15) باب مَا جَاءَ فِيمَنْ دَعَا إِلَى هُدًى فَاتُّبِعَ أَوْ إِلَى ضَلاَلَةٍ
Narrated Abu Hurairah:
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."
Reference: Jami` at-Tirmidhi 2674
In-book reference: Book 41, Hadith 30
English translation: Vol. 5, Book 39, Hadith 2674