וַיֵּ֙דַע֙ כָּל־יִשְׂרָאֵ֔ל מִדָּ֖ן וְעַד־בְּאֵ֣ר שָׁ֑בַע כִּ֚י נֶאֱמָ֣ן שְׁמוּאֵ֔ל לְנָבִ֖יא לַיהוָֽה׃
Es erkannte ganz Israel von Dan bis Beer Seba, dass Samuel als Prophet dem Herrn bewährt sei.
Mishneh Torah, Foundations of the Torah
The examination must be continued many times; if all of his words be found true, lo, this is a true prophet, as it is said of Samuel: "And all Israel from Dan even to Beer-Sheba knew that Samuel was established to be a prophet of the Lord" (I Sam. 3.20).