Musnad Ahmad 30:1344

Yunus narrated to us, Hammad narrated to us, from Abu al-Muhazzam, from Abu Hurairah, that the Messenger of Allah (peace and blessings of Allah be upon him) passed by a mangy kid (young goat) that its owners had cast out. He said: "Do you see this as insignificant to its owners?" They said: "Yes." He said: "The world is more insignificant to Allah, the Almighty and Majestic, than this is to its owners."