וְנִגְּשׁ֣וּ הַכֹּהֲנִים֮ בְּנֵ֣י לֵוִי֒ כִּ֣י בָ֗ם בָּחַ֞ר יְהוָ֤ה אֱלֹהֶ֙יךָ֙ לְשָׁ֣רְת֔וֹ וּלְבָרֵ֖ךְ בְּשֵׁ֣ם יְהוָ֑ה וְעַל־פִּיהֶ֥ם יִהְיֶ֖ה כָּל־רִ֥יב וְכָל־נָֽגַע׃
Entonces vendrán los sacerdotes hijos de Leví, porque á ellos escogió SEÑOR tu Dios para que le sirvan, y para bendecir en nombre de SEÑOR; y por el dicho de ellos se determinará todo pleito y toda llaga.
Chizkuni
ונגשו הכהנים, “and the priests will approach;” they as well as all the elders of the town nearest the slain person; the Torah resumes the narrative interrupted in verse 2. The priests are often identified with the judges of Israel, and have been referred to as such in that verse as colleagues of the elders.
Ibn Ezra
the kohanim, the descendants of Levi those that are clearly descended from Levi [cf. comment on 17: 9].
Sforno
לשרתו ולברך, the (Temple) service of the priests is instrumental in attaining expiation for the innocent blood spilled, and in securing blessing for the land.