Abu Al-Aswad Daili says that when Hazrat Mu'adh bin Jabal (may Allah be pleased with him) was in Yemen, a case regarding the inheritance of a Jew who had died and left behind a Muslim brother was presented before him. Hazrat Mu'adh (may Allah be pleased with him) said: I heard the Prophet Muhammad (peace and blessings be upon him) say that Islam increases, it does not decrease. And based on this hadith, he declared him (the Muslim brother) as an heir.