وَعَنِ ابْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا
سَمِعْتُ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «مَا مِنْ رَجُلٍ مُسْلِمٍ يَمُوتُ، فَيَقُومُ عَلَى جَنَازَتِهِ أَرْبَعُونَ رَجُلًا، لَا يُشْرِكُونَ بَِاللَّهِ شَيْئًا، إِلَّا شَفَّعَهُمْ اَللَّهُ فِيهِ»
‘I heard the Messenger of Allah (sallallahu alayhi wa sallam) say, ‘If a Muslim man dies and a group of forty people, who do not associate any one with Allah, pray for him, Allah will accept their intercession for him (by way of their DuA for him.’ Related by Muslim.’
Bulugh al-Maram 666, Book 3, Funerals, Hadith 26. 1 min read