Abu Ishaq al-Sabay'ai' أبو إسحاق السبيعي عمرو بن عبد الله · Chapters on Knowledge

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."