‘A’isha reported the Prophet as saying, "If a company of Muslims to the number of a hundred pray over a dead person, all of them interceding for him, their intercession for him will be accepted.” Muslim transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الجنائز / 1661
Hadith Gradingالألبانی:صَحِيحٌ | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (947/58)»