Kitab al-Zuhd (The Book of Asceticism) by Imam Ahmad ibn Hanbal (d. 241 AH / 855 CE) is a major compilation of early Islamic reports and narrations (
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Imam Ahmad smiled. "A metaphor. They will seek it digitally, instantly, without walking a mile or even sitting in a circle of knowledge. And that is fine. But remind them: zuhd cannot be downloaded. It is not information. It is a wound in the heart against love of praise, wealth, and status." Kitab al-Zuhd (The Book of Asceticism) by Imam