From Abdullah bin Mas'ud who said: "We asked the Messenger of Allah about walking behind the funeral. He said: 'Less than a trot. For if he was good, then you will be hastening him to it (goodness), and if he was evil, then it id only an inhabitant of the Fire that is being taken away." The funeral is (to be) followed. The one who precedes it shall not have the reward of those who follow it.'"  

سَأَلْنَا رَسُولَ اللَّهِ ﷺ عَنِ الْمَشْىِ خَلْفَ الْجَنَازَةِ فَقَالَ مَا دُونَ الْخَبَبِ فَإِنْ كَانَ خَيْرًا عَجَّلْتُمُوهُ وَإِنْ كَانَ شَرًّا فَلاَ يُبَعَّدُ إِلاَّ أَهْلُ النَّارِ الْجَنَازَةُ مَتْبُوعَةٌ وَلاَ تَتْبَعُ وَلَيْسَ مِنْهَا مَنْ تَقَدَّمَهَا