It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him): "Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) had a cup inlaid with copper, from which he would give the Prophet (peace and blessings be upon him) water to drink when he (peace and blessings be upon him) drank, and from which he would help him (peace and blessings be upon him) perform ablution when he (peace and blessings be upon him) performed ablution."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7847