اللَّهُمَّ انْفَعْنِي بِمَا عَلَّمْتَنِي وَعَلِّمْنِي مَا يَنْفَعُنِي وَزِدْنِي عِلْمًا
Allahumman-fa'ni bima 'allamtani wa 'allimni ma yanfa'uni wa zidni 'ilma
O Allah, benefit me with what You have taught me, teach me what will benefit me, and increase me in knowledge.
At-Tirmidhi 5:742, Ibn Majah 1:92
اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عِلْمٍ لَا يَنْفَعُ وَمِنْ قَلْبٍ لَا يَخْشَعُ وَمِنْ نَفْسٍ لَا تَشْبَعُ وَمِنْ دَعْوَةٍ لَا يُسْتَجَابُ لَهَا
Allahumma inni a'udhu bika min 'ilmin la yanfa'u wa min qalbin la yakhsha'u wa min nafsin la tashba'u wa min da'watin la yustajabu laha
O Allah, I seek refuge in You from knowledge that does not benefit, from a heart that does not fear, from a soul that is not satisfied, and from a supplication that is not answered.
Sahih Muslim 4:2088, Abu Dawud