Abdullah bin al-Samit narrates that Sayyiduna Abu Dharr (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever ties up and stores gold or silver and does not spend it in the way of Allah, it will become a live coal on the Day of Resurrection with which he will be branded."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1628