Nabi's doa for knowledge is: 'Allahumma inni as'aluka 'ilman nafi'an, wa rizqan tayyiban, wa 'amalan mutaqabbalan' — O Allah, I ask You for beneficial knowledge, good provision, and accepted deeds. He would recite this every morning after Fajr shalat.
اللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْمًا نَافِعًا، وَرِزْقًا طَيِّبًا، وَعَمَلًا مُتَقَبَّلًا
Allahumma inni as'aluka 'ilman nafi'an, wa rizqan tayyiban, wa 'amalan mutaqabbalan.
Meaning: O Allah, I ask You for beneficial knowledge, good provision, and accepted deeds.
Source: Sunan Ibn Majah #925This comprehensive doa asks for the three pillars of a blessed life: knowledge that benefits (not mere information), provision that is pure and lawful, and deeds that are accepted by Allah. Nabi (shallallahu alaihi wa sallam) sought refuge from knowledge that does not benefit (Sahih Muslim 2722), showing that not all knowledge is equally valuable — only that which brings one closer to Allah.
اللَّهُمَّ إِنِّي أَسْأَلُكَ عِلْمًا نَافِعًا، وَرِزْقًا طَيِّبًا، وَعَمَلًا مُتَقَبَّلًا
The Prophet (peace be upon him) used to say after the Fajr prayer: 'Allahumma inni as'aluka 'ilman nafi'an, wa rizqan tayyiban, wa 'amalan mutaqabbalan.'