اللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْمًا نَافِعًا، وَرِزْقًا طَيِّبًا، وَعَمَلًا مُتَقَبَّلًا
Allahumma inni as'aluka 'ilman nafi'an, wa rizqan tayyiban, wa 'amalan mutaqabbala
Ee Allah, ninakuomba elimu yenye manufaa, riziki njema, na matendo yanayokubaliwa.
Recite after Fajr prayer
The Prophet (PBUH) used to say this dua after the Fajr prayer.