Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ahmad-zuhd:731ʿAbdullāh from my father > ʿAbd al-Raḥman > Sulaymān b. al-Mughīrah > Ḥumayd b. Hilāl

[Machine] Abu Darda said, "Indeed, the thing I fear the most when I meet my Lord, the Blessed and Exalted, is that He will say to me, 'You knew, so what have you done with what you knew?'"  

الزهد لأحمد:٧٣١حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنِي أَبِي حَدَّثَنَا عَبْدُ الرَّحْمَنِ حَدَّثَنَا سُلَيْمَانُ بْنُ الْمُغِيرَةِ عَنْ حُمَيْدِ بْنِ هِلَالٍ قَالَ

قَالَ أَبُو الدَّرْدَاءِ إِنَّ أَخْوَفَ مَا أَخَافُ إِذَا لَقِيتُ رَبِّي تَبَارَكَ وَتَعَالَى أَنْ يَقُولَ لِي قَدْ عَلِمْتَ فَمَاذَا عَمِلْتَ فِيمَا عَلِمْتَ  


See similar narrations below:

Collected by Suyūṭī
suyuti:621-80bAbū al-Dardāʾ > In Akhwaf Mā Akhāf Idhā And Qaft > al-Ḥisāb > Yuqāl Ly
Request/Fix translation

  

السيوطي:٦٢١-٨٠b

"عَنْ أَبِي الدَّرْدَاءِ قَالَ: إِنَّ أَخْوَفَ مَا أَخَافُ إِذَا وَقَفْتُ عَلَى الْحِسَابِ أَنْ يُقَالَ ليِ: قَدْ عَلِمْتَ فَمَاذَا عَمِلتَ فِيمَا عَلِمْتَ؟ ".  

[كر] ابن عساكر في تاريخه