Sunan Ibn Majah, Chapter: The Book of the Sunnah

that 'Abdullah bin Mughaffal was sitting beside a nephew of his; the nephew hurled a pebble and he told him not to do that, and he said: "The Messenger of Allah (saw) had forbidden that. He (the Prophet) said: 'It cannot be used for hunting and it cannot harm an enemy, but it may break a tooth or put an eye out.'" He said: "His nephew hurled another pebble and he ('Abdullah bin Mughaffal) said: 'I tell you that the Messenger of Allah forbade that (and you go and hurl another pebble)? I will never speak to you again.'" (Sahih)