اللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْماً نَافِعاً وَرِزْقاً طَيِّباً، وَعَمَلاً مُتَقَبَّلاً . (بَعْد السّلامِ من صَلاةِ الفَجْر )
Allahumma innee as-aluka AAilman nafiAAan, warizqan tayyiban, waAAamalan mutaqabbalan.(after salam from fajr prayer).
O Allah, I ask You for knowledge which is beneficial and sustenance which is good, and deeds which are acceptable. (To be said after giving salam for the fajr prayer)
Ibn Majah 1:152