Narrated Ibn `Abbas: The Prophet once passed by two graves and said, They (the deceased persons in those graves) are being tortured not for a great thing to avoid. And then added, Yes, (they are being punished for a big sin), for one of them used to go about with calumnies while the other never saved himself from being soiled with his urine. (Ibn `Abbas added): Then he took a green leaf of a date-palm) and split it into two pieces and fixed one piece on each grave and said, May their punishment be abated till these (two pieces) get dry.