וַיֵּ֙דַע֙ כָּל־יִשְׂרָאֵ֔ל מִדָּ֖ן וְעַד־בְּאֵ֣ר שָׁ֑בַע כִּ֚י נֶאֱמָ֣ן שְׁמוּאֵ֔ל לְנָבִ֖יא לַיהוָֽה׃
And all Israel from Dan even to Beer-sheba knew that Samuel was established to be a prophet of the LORD.
Read halakhic rulings (Jewish law) on I Samuel 3:20: and classical halakhic sources.