Numbers 3:10

וְאֶת־אַהֲרֹ֤ן וְאֶת־בָּנָיו֙ תִּפְקֹ֔ד וְשָׁמְר֖וּ אֶת־כְּהֻנָּתָ֑ם וְהַזָּ֥ר הַקָּרֵ֖ב יוּמָֽת׃ פ

καὶ Ἀαρὼν καὶ τοὺς υἱοὺς αὐτοῦ καταστήσεις ἐπὶ τῆς σκηνῆς τοῦ μαρτυρίου, καὶ φυλάξουσ·ιν τὴν ἱερατίαν αὐτῶν καὶ πάντα τὰ κατὰ τὸν βωμὸν καὶ ἔσω τοῦ καταπετάσματος· καὶ ὁ ἀλλογενὴς ὁ ἁπτόμενος ἀποθανεῖται.

Greek text from Swete's edition, CC BY-SA 4.0

Y constituirás á Aarón y á sus hijos, para que ejerzan su sacerdocio: y el extraño que se llegare, morirá.

So you shall appoint Aaron and his sons to carry out the duties of the priesthood; but any outsider who approaches the tabernacle must be put to death.”