Why Ten Righteous and the Flood Generation Left Eight

Yalkut Shimoni on Torah 83:11

Another interpretation. Why ten [as the number of righteous Abraham bargained for to spare Sodom]? Because in the generation of the flood eight already remained [Noah, his three sons, and their four wives], and yet the world was not spared on their merit. [Therefore Abraham did not press below ten, for fewer than ten could not stand for a whole city.]

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