Musnad Abu Ya'la al-Mawsili 150:370

Abu Talib Abd al-Jabbar ibn Asim narrated to us, Ubayd Allah ibn Amr narrated to me, from Ayyub, from Abu Qilabah, from Abdullah ibn Yazid, from Aisha, from the Prophet (peace be upon him), who said: "No one among the Muslims dies, and a group of Muslims prays over him, reaching the number of one hundred, and they intercede for him, but that they are granted intercession for him."