Shal b. Sa'd reported God's messenger as saying, "I shall go to the Pond before you; he who comes to me will drink, and he who drinks will never thirst. Folk whom I know and who know me will come down to me, but something will come between them and me. I shall say that they belong to me, but I shall be told that I do not know what innovations they have produced since I departed from them. I shall then say, `Destruction, destruction to those who have made changes since my departure'!" (Bukhari and Muslim.)