It was narrated from 'Upbah that:

the Messenger of Allah went out one day and offered the funeral prayer for the people f Uhd, then he went to the Minbar and said: "I am your predecessor and I am a witness over your."

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ يَزِيدَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ خَرَجَ يَوْمًا فَصَلَّى عَلَى أَهْلِ أُحُدٍ صَلاَتَهُ عَلَى الْمَيِّتِ ثُمَّ انْصَرَفَ إِلَى الْمِنْبَرِ فَقَالَ " إِنِّي فَرَطٌ لَكُمْ وَأَنَا شَهِيدٌ عَلَيْكُمْ " .