Musnad Ahmad 1156:229

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Musa ibn Abi ‘Aishah, from a freed slave of Umm Salamah, from Umm Salamah, that the Messenger of Allah (peace and blessings of Allah be upon him) used to say when he prayed the morning prayer, as he would say the taslim: [He would say:] "O Allah, I ask You for beneficial knowledge, and goodly provision, and deeds that are accepted."