by Imam Malik, translation by A'isha `Abdarahman at-Tarjumana and Ya`qub Johnson , Volume: Shortening the Prayer
Chapter: General Remarks concerning the Voluntary Prayer of Duha
Yahya related to me from Malik from Ishaq ibn Abdullah ibn Abi Talha from Anas ibn Malik that his grandmother, Mulayka, invited the Messenger of Allah, may Allah bless him and grant him peace, for food and he ate some of it. Then the Messenger of Allah, may Allah bless him and grant him peace, said, "Get up and I will lead you in prayer."
Anas said, "I stood up and took a woven mat belonging to us that had become black through long use and sprinkled it with water, and the Messengerof Allah, may Allah bless him and grant him peace, stood on it. The orphan and I formed a row behind him, and the old woman stood behind us. He prayed two rakas with us and then left."
Yahya related to me from Malik from Ibn Shihab that Ubaydullah ibn Abdullah ibn Utba said, "I visited Umar ibn al-Khattab just before noon and found him praying a voluntary prayer. So I stood behind him, but he pulled me nearer and put me next to him, on his right hand side, and then Yarfa came and I moved back and we formed a row behind him."