Sahl bin Mu'adh bin Anas narrated from his father that:
The Prophet said: "Whoever teaches some knowledge will have the reward of the one who acts upon it, without that detracting from his reward in the slightest." (RU)
English reference (RU): Vol. 1, Book 1, Hadith 240 (RU)
Arabic reference (RU): Book 1, Hadith 246 (RU)