سنن ابن ماجه

It was narrated from Umm Salamah that when the Prophet (ﷺ) performed the Subh (morning prayer), while he said the Salam, he would say: ‘Allahumma inni as’aluka ‘ilman nafi’an, wa rizqan tayyiban, wa ‘amalan mutaqabbalan (O Allah, I ask You for beneficial knowledge, goodly provision and acceptable deeds).’”