Sahih Muslim
The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fadail Al-Sahabah)
Book Number: 031 / Hadith Number: 6011
Anas reported that Allah's Apostle (may peace be upon him) said: I entered Paradise and heard the noise of steps. I said: Who is it? They said: She is Ghumaisa, daughter of Milhan, the mother of Anas b. Malik.