Mishkat al-Masabih #250
Knowledge
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ سُفْيَانَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ قَالَ لِكَعْبٍ: مَنْ أَرْبَابُ الْعِلْمِ؟ قَالَ: الَّذِي يَعْمَلُونَ بِمَا يَعْلَمُونَ. قَالَ: فَمَا أَخْرَجَ الْعِلْمَ مِنْ قُلُوبِ الْعُلَمَاءِ؟ قَالَ الطَّمَعُ. رَوَاهُ الدَّارِمِيُّ
Sufyan said that ‘Umar b. al-Khattab asked Ka‘b who were the lords
of knowledge, and he replied that they are those who act according to
what they know. He then asked what it is that takes knowledge from
the hearts of the learned and was told that it is covetousness. Darimi
transmitted it.
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About Mishkat al-Masabih
This hadith is #250 from Mishkat al-Masabih, in the Book of Knowledge.