The Messenger of Allah (sal Allahu alaihi wa sallam) said: “O Abu Dharr! If you learn one verse from The Book of Allah (The Quran), it is better for you than to voluntarily pray one hundred rakahs; and if you learn a category of knowledge (religion), regardless if it is applied or not, it is better for you than to voluntarily pray one thousand rakahs.” [Sunan Ibn Majah]
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This is not authentic.