Ibn Abbas (Allah be pleased with him) narrates: ' The Messenger of Allah (Allah bless him & give him peace) once passed by two graves and said: 'They (in the grave) are being punished not for a great thing to avoid' Then he added: 'Yes, (they are being punished for a great sin), for one of them used to go about with calumnies while the other never saved himself from the splashes of urine' Ibn Abbas said: 'Then he (Sallallahu Alayhi Wasallam) took a green leaf and split it into two pieces, then placed one piece on each of the two graves and said: 'Their punishment may decrease until these two pieces become dry' (Sahih al-Bukhari, no. 1312).