Umm Salamah (RA) narrates that the Prophet (S) would make this duʻā after praying Fajr prayer.
اللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْمًا نَافِعًا وَرِزْقًا طَيِّبًا وَاسِعًا وَعَمَلًا مُتَقَبَّلًا
Allāhumma ʼinnī ʼasʼaluka ʻilman nāfiʻan, wa rizqan ṭayyiban wāsiʻan, wa ʻamalan mutaqabbalan
O Allah! I ask You for knowledge which is beneficial, and sustenance which is pure/good and wide/abundant, and deeds which are accepted.
Recorded in Musnad of Imam Aḥmad.