King James Version (KJV)
And all Israel from Dan even to Beersheba knew that Samuel {was} established {to be} a prophet of the LORD. {established: or, faithful}
Modern English
All Israel from Dan even to Beersheba knew that Samuel was established to be a prophet of Yahweh.
Hebrew
וַיֵּ֙דַע֙ כָּל־יִשְׂרָאֵ֔ל מִדָּ֖ן וְעַד־בְּאֵ֣ר שָׁ֑בַע כִּ֚י נֶאֱמָ֣ן שְׁמוּאֵ֔ל לְנָבִ֖יא לַיהוָֽה׃
vayedaʿ kal-yishraʾel midan vʿad-bʾer shabaʿ kiy neʾeman shmvʾel lnabiyʾ layhvah