Mishkat al-Masabih #238
Knowledge
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ وَاثِلَةَ بْنِ الْأَسْقَعِ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ طَلَبَ الْعِلْمَ فَأَدْرَكَهُ كَانَ لَهُ كِفْلَانِ مِنَ الْأَجْرِ فَإِنْ لَمْ يُدْرِكْهُ كَانَ لَهُ كفل من الْأجر» . رَوَاهُ الدِّرَامِي
Wathila b. al-Asqa‘ reported God’s messenger as saying, “He who seeks knowledge and attains it will have a double portion of reward,
but if he does not attain it he will have a single portion of reward."
Darimi transmitted it.
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About Mishkat al-Masabih
This hadith is #238 from Mishkat al-Masabih, in the Book of Knowledge.