Narrated `Abdullah bin Maghaffal:

that he saw a man throwing stones with two fingers (at something) and said to him, "Do not throw stones, for Allah's Messenger (peace be upon him) has forbidden throwing stones, or he used to dislike it." `Abdullah added: Throwing stones will neither hunt the game, nor kill (or hurt) an enemy, but it may break a tooth or gouge out an eye."

Afterwards `Abdullah once again saw the man throwing stones. He said to him, "I tell you that Allah's Messenger (peace be upon him) has forbidden or disliked the throwing the stones (in such a way), yet you are throwing stones! I shall not talk to you for such-and-such a period." (Bukhari)

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