It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) used to say: "I enter this upper room at that time only out of fear that there may be some wealth in it, and that I may die without having spent it."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 7074