Musnad Ahmad 1156:228

Waki’ narrated to us, Sufyan and ‘Abd al-Rahman narrated to us, from Sufyan, from Musa ibn Abi ‘Aishah, from a freed slave of Umm Salamah, from Umm Salamah—‘Abd al-Rahman said in his narration: from someone who heard Umm Salamah—narrating that the Prophet, peace and blessings of Allah be upon him, used to say after the dawn prayer, when he had finished praying: "O Allah, I ask You for beneficial knowledge, and acceptable deeds, and goodly provision."