Sayyiduna Imran bin Husayn (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) with a ring of brass around his neck. He (peace and blessings be upon him) asked: "What is this?" He said: It is for weakness (al-wahinah). He (peace and blessings be upon him) said: "Would you like to be left to it? Take it off and throw it away."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19609