Umm Salamah (RA) said: "The Messenger of Allah (ﷺ) used to say these words after the salutation, at the end of the Fajr prayer."

اَللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْمًا نَافِعًا وَرِزْقًا طَيِّبًا وَعَمَلًا مُتَقَبَّلًا

Allaahumma innee as’aluka ‛ilman naafi‛an, warizqan tayyiban, wa ‛amalan mutaqabbalaa

O Allah, I ask You for knowledge which is beneficial and sustenance which is good, and deeds which are acceptable.

Reference: Sahih (Albani). Ibn Majah: 925