It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Any servant who dies in this world and leaves behind gold and silver (that he hoarded) will be branded with it."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7605