Musnad Ahmad 32:15

Hushaym narrated to us, Humayd informed us, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I entered Paradise and heard a rustling sound in front of me. Behold, it was al-Ghumaysa' bint Milhan, the mother of Anas ibn Malik."