Musannaf Ibn Abi Shaybah

Hazrat Bahr bin Marar narrates from his grandfather Hazrat Abu Bakrah that he said: I was walking with the Noble Prophet (peace and blessings be upon him) when he passed by two graves. The Prophet (peace and blessings be upon him) said: These two are being punished. Who will bring me a date-palm stick? Hazrat Abu Bakrah says that I and another person hurried and brought a date-palm stick to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) split the stick from its end into two parts and placed one on one grave and the other on the second grave, and said: As long as there is moisture in these sticks, perhaps because of it their punishment will be lessened. They are being punished for backbiting and for not protecting themselves from urine (drops).