Musnad Ahmad 1119:39

Waki’ narrated to us, from an-Nahhas, from Shaddad Abu ‘Ammar, from ‘Awf ibn Malik, who said: The Messenger of Allah (ﷺ) said: "I and a dark-complexioned woman will be in Paradise like these two: a woman who was widowed by her husband, and she restrained herself for her orphans until they became independent or died."