Musnad Abu Ya'la al-Mawsili 150:302

Musa ibn Muhammad narrated to us, Abd al-Wahhab ibn Abd al-Majid narrated to us, from Ayyub, from Abu Qilabah, from Abdullah ibn Yazid, from Aisha, from the Messenger of Allah (may Allah bless him and grant him peace), 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, except that they are granted intercession for him."