‏ 1 Samuel 10:8

8. thou shalt go down before me to Gilgal--This, according to Josephus, was to be a standing rule for the observance of Saul while the prophet and he lived; that in every great crisis, such as a hostile incursion on the country, he should repair to Gilgal, where he was to remain seven days, to afford time for the tribes on both sides Jordan to assemble, and Samuel to reach it.

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