Sunan Ibn Majah, Chapter: The Chapters on Hunting

that a relative of Abdullah bin Mughaffal threw some small pebbles. He told him not to do that and said: "The Prophet (saw) forbade throwing small pebbles and said: 'They do not kill any game nor hurt the enemy, but they can break a tooth or put out an eye.'" He did it again, and he (Abdullah) said: "I tell you that the Prophet (saw) forbade that and then you go and do it again? I will never speak to you again."