Should anyone amongst you see a bier he must stand up so long as it is within sight in case he does not intend to follow it. (Using translation from Muslim 958c)
قَالَ النَّبِيُّ ﷺ إِذَا رَأَىأَحَدُكُمُ الْجِنَازَةَ فَلْيَقُمْ حِينَ يَرَاهَا حَتَّى تُخَلِّفَهُ إِذَا كَانَ غَيْرَ مُتَّبِعِهَا