It is narrated from Sayyiduna Abu Rafi' (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) performed ablution, he would move his ring.
(b) Imam al-Bukhari (may Allah have mercy on him) said: Ma'mar bin Muhammad bin Ubaydullah bin Abi Rafi' is munkar al-hadith (his narrations are rejected).
(c) The Shaykh said: In this matter, reliance is placed on the report from Sayyiduna Ali (may Allah be pleased with him) and others.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 260