It is narrated from Yahya bin Ya'mar (may Allah have mercy on him) that Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) used to make the Muslim an heir of the dhimmi, but did not make the dhimmi an heir of the Muslim, and he would say: I heard the Messenger of Allah (peace and blessings be upon him) say: "Indeed, Islam increases and does not decrease." The Shaykh (the author, Imam al-Tabarani) said: "Amr bin Kurdi is the same as Amr bin Abi Hakim, from whom Shu'bah narrated."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17476