Musnad Abu Ya'la al-Mawsili 150:362

'Abd al-Rahman ibn Salih al-Azdi narrated to us, Hafs ibn Ghiyath narrated to us, from Layth ibn Abi Sulaym, from Muhammad ibn al-Munkadir, from Umm Dharr, from 'Aishah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I and the guardian of the orphan are in Paradise like these two," and he joined his index finger and middle finger. "And the one who strives for the orphan, the widow, and the needy is like the mujahid in the way of Allah, and the one who fasts and prays, never tiring."