en_tn_condensed/mrk/13/19.md

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such as has not been from the beginning

"greater than there has ever been since the beginning of the world." This describes how great and terrible the tribulation will be. There has never been a tribulation as terrible as this one will be.

no, nor ever will be again

"and greater than there will ever be again" or "and after that tribulation, there will never again be a tribulation like it"