'Stones' in the Bible

And always, night and day, he was in the mountains, and in the tombs, crying, and cutting himself with stones.

And again he sent unto them another servant; and at him they cast stones, and wounded him in the head, and sent him away shamefully handled.

And as he went out of the temple, one of his disciples saith unto him, Master, see what manner of stones and what buildings are here!