The Prophet ﷺ said, "If any one of you see a funeral procession and he is not going along with it, then he should stand and remain standing till he gets behind it, or it leaves him behind, or the coffin is put down before it goes ahead of him . "  

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا رَأَى أَحَدُكُمْ جَنَازَةً فَإِنْ لَمْ يَكُنْ مَاشِيًا مَعَهَا فَلْيَقُمْ حَتَّى يُخَلِّفَهَا أَوْ تُخَلِّفَهُ أَوْ تُوضَعَ مِنْ قَبْلِ أَنْ تُخَلِّفَهُ  

That his father said, "While we were accompanying a funeral procession, Abu Huraira got hold of the hand of Marwan and they sat down before the coffin was put down. Then Abu Saʿid came and took hold of Marwan's hand and said, "Get up. By Allah, no doubt this (i.e. Abu Huraira) knows that the Prophet forbade us to do that." Abu Huraira said, "He (Abu Saʿid) has spoken the truth."  

كُنَّا فِي جَنَازَةٍ فَأَخَذَ أَبُو هُرَيْرَةَ ؓ بِيَدِ مَرْوَانَ فَجَلَسَا قَبْلَ أَنْ تُوضَعَ فَجَاءَ أَبُو سَعِيدٍ ؓ فَأَخَذَ بِيَدِ مَرْوَانَ فَقَالَ قُمْ فَوَاللَّهِ لَقَدْ عَلِمَ هَذَا أَنَّ النَّبِيَّ ﷺ نَهَانَا عَنْ ذَلِكَ فَقَالَ أَبُو هُرَيْرَةَ صَدَقَ