Musnad Ahmad 1253:0

Narrated Khawlah bint Thamir al-Ansariyyah: I heard the Messenger of Allah (ﷺ) say: "Indeed, this wealth is sweet and green. Whoever acquires it rightfully, it will be blessed for him. And whoever acquires it wrongfully, he is like one who eats and is never satisfied, and it will be a witness against him on the Day of Resurrection." She said: I said: "O Messenger of Allah, I heard you say something that frightened me." He said: "It is not as you think, Khawlah. Rather, it is like a traveler who has a mount that he rides, and he consumes from the wealth of Allah that which is in his hands. Whoever takes it rightfully, it is a help for him. And whoever takes it wrongfully, he is like one who eats and is never satisfied, and it will be a witness against him on the Day of Resurrection."