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https://www.salafisounds.com/an-introduction-to-the-book-usul-us-sunnah-foundations-of-the-sunnah-of-imam-ahmad-bin-hanbal-rahimahullah-by-abu-khadeejah-abdul-wahid/
The Early Ahlul-Hadīth and their Books in Defence of the Salafi Creed―Foundations of the Sunnah Imām Ahmad bin Hanbal (1) ―by Abu Khadeejah