Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah ﷺ said, "He who calls others to follow the Right Guidance will have a reward equal to the reward of those who follow him, without their reward being diminished in any respect on that account."

[Muslim].

وعنه أيضًا رضي الله عنه أن رسول الله ﷺ قال: "من دعا إلى هدى كان له من الأجر مثل أجور من تبعه لا ينقص ذلك من أجورهم شيئًا ((رواه مسلم)).