If a company of Muslims numbering one hundred pray over a dead person, all of them interceding for him, their intercession for him will be accepted.  

عَنِ النَّبِيِّ ﷺ قَالَ مَا مِنْ مَيِّتٍ يُصَلِّي عَلَيْهِ أُمَّةٌ مِنَ الْمُسْلِمِينَ يَبْلُغُونَ مِائَةً كُلُّهُمْ يَشْفَعُونَ لَهُ إِلاَّ شُفِّعُوا فِيهِ قَالَ فَحَدَّثْتُ بِهِ شُعَيْبَ بْنَ الْحَبْحَابِ فَقَالَ حَدَّثَنِي بِهِ أَنَسُ بْنُ مَالِكٍ عَنِ النَّبِيِّ ﷺ  

The Prophet said: "No one among the Muslim dies, and Salat is performed for him by a community of Muslims reaching one hundred, and they intercede (supplicate) for him, except that their intercession for him is accepted." In his narration, 'Ali bin Hujr said: "One hundred or more than that."  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَمُوتُ أَحَدٌ مِنَ الْمُسْلِمِينَ فَتُصَلِّي عَلَيْهِ أُمَّةٌ مِنَ الْمُسْلِمِينَ يَبْلُغُونَ أَنْ يَكُونُوا مِائَةً فَيَشْفَعُوا لَهُ إِلاَّ شُفِّعُوا فِيهِ وَقَالَ عَلِيُّ بْنُ حُجْرٍ فِي حَدِيثِهِ مِائَةً فَمَا فَوْقَهَا  

"There is no deceased person for whom a group of Muslims whose number reaches one hundred, offers the funeral prayer, interceding for him; but their intercession for him will be accepted." (One of the narrators) Sallam said: "I narrated it to Shu'aib bin Al-Habhab and he said: 'Anas bin Malik narrated it to me from the Prophet.'" (Using translation from Nasāʾī 1991)  

عَنِ النَّبِيِّ ﷺ قَالَ مَا مِنْ مَيِّتٍ يُصَلِّي عَلَيْهِ أُمَّةٌ مِنَ النَّاسِ مِنَ الْمُسْلِمِينَ يَبْلُغُونَ أَنْ يَكُونُوا مِائَةً فَيَشْفَعُونَ لَهُ إِلَّا شُفِّعُوا فِيهِ قَالَ سَلَّامٌ فَحَدَّثْتُ بِهِ شُعَيْبَ بْنَ الْحَبْحَابِ فَقَالَ حَدَّثَنِي بِهِ أَنَسُ بْنُ مَالِكٍ عَنِ النَّبِيِّ ﷺ  

"There is no deceased person for whom a group of Muslims whose number reaches one hundred, offers the funeral prayer, interceding for him; but their intercession for him will be accepted." (One of the narrators) Sallam said: "I narrated it to Shu'aib bin Al-Habhab and he said: 'Anas bin Malik narrated it to me from the Prophet.'" (Using translation from Nasāʾī 1991)  

عَنِ النَّبِيِّ ﷺ قَالَ «مَا مِنْ مَيِّتٍ يُصَلِّي عَلَيْهِ أُمَّةٌ مِنَ الْمُسْلِمِينَ يَبْلُغُونَ أَنْ يَكُونُوا مِائَةً يَشْفَعُونَ إِلَّا شُفِّعُوا فِيهِ» قَالَ سَلَّامٌ فَحَدَّثْتُ بِهِ شُعَيْبَ بْنَ الْحَبْحَابِ فَقَالَ هَكَذَا حَدَّثَنِي بِهِ أَنَسُ بْنُ مَالِكٍ عَنِ النَّبِيِّ ﷺ  

If a company of Muslims numbering one hundred pray over a dead person, all of them interceding for him, their intercession for him will be accepted. (Using translation from Muslim 947)   

النَّبِيِّ ﷺقَالَ مَا مِنْ مَيِّتٍ يُصَلِّي عَلَيْهِ أُمَّةٌ مِنَ الْمُسْلِمِينَ يَبْلُغُونَ مِائَةً كُلُّهُمْ يَشْفَعُونَ لَهُ إِلَّا شُفِّعُوا فِيهِ قَالَ سَلَّامٌ فَحَدَّثْتُ بِهِ شُعَيْبَ بْنَ الْحَبْحَابِ فَقَالَ حَدَّثَنِي بِهِ أَنَسُ بْنُ مَالِكٍ عَنِ النَّبِيِّ ﷺ  

"مَا مِنْ مَيِّت يُصَلِّي عَلَيهِ أُمَّةٌ مِن المسلِمِينَ يَبْلُغُونَ أَن يكونوا مِائَةً فَيَشْفَعُونَ لَهُ إلَّا شُفِّعُوا فِيهِ".