Musnad Ahmad 32:1570

Hassan narrated to us, Hammad ibn Salamah narrated to us, from Thabit al-Bunani, 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. I said: 'What is this rustling?' It was said: 'This is al-Rumaysa' bint Milhan, and she is the mother of Anas ibn Malik.'"