Musnad Ahmad 1156:130

Rawh narrated to us, Shu'bah narrated to us, from Musa ibn Abi 'Aishah, he said: I heard a freed slave of Umm Salamah narrating that he heard Umm Salamah saying: The Messenger of Allah, peace and blessings of Allah be upon him, used to say when he prayed the morning prayer, when he would say the taslim: "O Allah, I ask You for beneficial knowledge, and goodly provision, and acceptable deeds."