Narrated Anas:

A funeral procession passed in front of the Prophet and the people praised the deceased. The Prophet ﷺ said, "It has been affirmed (Paradise)." Then another funeral procession passed by and the people talked badly of the deceased. The Prophet ﷺ said, "It has been affirmed (Hell)." Allah's Apostle was asked, "O Allah's Apostle! You said it has been affirmed for both?" The Prophet ﷺ said, "The testimony of the people (is accepted), (for) the believer are Allah's witnesses on the earth."

حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ مُرَّ عَلَى النَّبِيِّ ﷺ بِجَنَازَةٍ، فَأَثْنَوْا عَلَيْهَا خَيْرًا فَقَالَ " وَجَبَتْ ". ثُمَّ مُرَّ بِأُخْرَى فَأَثْنَوْا عَلَيْهَا شَرًّا ـ أَوْ قَالَ غَيْرَ ذَلِكَ ـ فَقَالَ " وَجَبَتْ ". فَقِيلَ يَا رَسُولَ اللَّهِ، قُلْتَ لِهَذَا وَجَبَتْ، وَلِهَذَا وَجَبَتْ، قَالَ " شَهَادَةُ الْقَوْمِ، الْمُؤْمِنُونَ شُهَدَاءُ اللَّهِ فِي الأَرْضِ ".