A priest must not defile himself (by going to funerals or cemeteries) for anyone except relatives

Then the LORD said to Moses, "Speak to the priests, the sons of Aaron, and say to them: 'No one shall defile himself for a dead person among his people,

Hebrew

א וַיֹּאמֶר יְהוָה אֶל-מֹשֶׁה, אֱמֹר אֶל-הַכֹּהֲנִים בְּנֵי אַהֲרֹן; וְאָמַרְתָּ אֲלֵהֶם, לְנֶפֶשׁ לֹא-יִטַּמָּא בְּעַמָּיו.

Greek

1 Καὶ εἶπεν κύριος πρὸς Μωυσῆν λέγων Εἰπὸν τοῖς ἱερεῦσιν τοῖς υἱοῖς Ααρων καὶ ἐρεῖς πρὸς αὐτούς Ἐν ταῖς ψυχαῖς οὐ μιανθήσονται ἐν τῷ ἔθνει αὐτῶν

• Parashah: Emor
• Sefer HaChinuch: 263
• Mishneh Torah: Judges — Mourning

• Leviticus 21:1

Enumeration and classification from BibleData. The Greek is the Septuagint reading of the same verse, carried by the source for comparison.