Musannaf Ibn Abi Shayba 36:5

Abu Mu'awiyah narrated to us, from al-A'mash, from Abu Sufyan, from 'Ubayd ibn 'Umayr, who said: When Allah willed to destroy the companions of the elephant, He sent upon them birds created from the sea, like swallows. Each bird among them carried three variegated stones: two stones in its feet and one stone in its beak. He said: They came until they lined up over their heads, then they cried out and dropped what was in their feet and their beaks. Not a stone would fall upon the head of a man except that it would exit from his posterior, and it would not fall upon any part of his body except that it would exit from the other side. He said: And Allah sent a severe wind, so it struck the stones and increased their intensity. He said: And they were all destroyed.