Musannaf Ibn Abi Shayba 28:1103

Al-Fadl ibn Dukayn narrated to us, he said: Sa'id ibn 'Abd al-Rahman narrated to us, from Yahya ibn Abi Ishaq, from Anas ibn Malik, that he was with the Messenger of Allah (may Allah bless him and grant him peace). When he was at the back of Medina, or the Harrah, the Messenger of Allah (may Allah bless him and grant him peace) said: "Returning, repenting, worshipping, if Allah wills, to our Lord praising."