The Book of Zakat (Kitab Al-Zakat)
Muslim :: Book 5 : Hadith 2285
Ibn Abbas reported Allah's Messenger (may peace be upon him) as saying: If there were for the son of Adam a valley full of riches, he would long to possess another one like it. and Ibn Adam does not feel satiated but with dust. 1413 And Allah returns to him who returns (to HiM). 1414 Ibn Abbas said: I do not know whether it is from the Qur'an or not; and in the narration transmitted by Zuhair it was said: I do not know whether it is from the Qur'an, and he made no mention of Ibn Abbas.