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When did Josias beget Jechonias?
Matthew: “And Josias begat Jechonias and his brethren, about the time they were carried away into Babylon” ([i, 11]).
Josiah became king 641 B. C. and died 610 B. C. Jechonias was carried to Babylon 588 B. C., 22 years after Josiah died.