Two brothers, one a Jew and the other a Muslim, brought their dispute before Yahya bin Yamar, who awarded the inheritance to the Muslim. He said, "Abu Aswad told me that a man related to him that Muaz reported, 'I heard the Messenger of Allah ﷺ say, "Islam increases and does not decrease."'" So he gave the inheritance to the Muslim.
حدثنا مسدد حدثنا عبد الوارث عن عمرو بن أبي حكيم الواسطي
أن أخوين اختصما إلى يحيى بن يعمر يهودي ومسلم فورث المسلم منهما وقال حدثني أبو الأسود أن رجلا حدثه أن معاذا حدثه قال سمعت رسول الله ﷺ يقول الإسلام يزيد ولا ينقص فورث المسلم
No references are available.
Its isnad is daif. See the following hadith. Bayhaqi (6/205, 254, 255) also narrated it from Abu Dawud through the same route, and said, "This is an unknown man, so it is disconnected (!)" So the chain is daif due to the man's being unknown.