He who offers prayer for the dead, for him is (the reward of) one qirat; and he who follows the bier till it is placed in the grave, for him (is the reward of) two qirats. I (Abu Hazim, one of the narrators) said: Abu Huraira, what is a qirat? He said: It is like the hill of Uhud. (Using translation from Muslim 945e)
عَنِ النَّبِيِّ ﷺ قَالَ مَنْ صَلَّى عَلَى جَنَازَةٍ فَلَهُ قِيرَاطٌ فَإِنْ تَبِعَهَا حَتَّى تُوضَعَ فِي الْقَبْرِ فَقِيرَاطَانِ قَالَ قُلْتُ يَا أَبَا هُرَيْرَةَ مَا الْقِيرَاطُ؟ قَالَ مِثْلُ أُحُدٍ