Sunan Ibn Majah, Chapter: Chapters Regarding Funerals

"I saw Anas bin Malik offering the funeral prayer for a man, and he stood level with his head. Then another funeral was brought, that of a woman, and they said: 'O Abu Hamzah! Offer the funeral prayer for her.' So he stood level with the middle of the bed (the body was upon). 'Ala' bin Ziyad said to him: 'O Abu Hamzah! Is this how you saw the Messenger of Allah (saw) standing in relation to the body of a man and a woman as you have stood?' He said: 'Yes.' Then he turned to us and said: 'Remember this.'" Sahih