Do not prophesy in the name of idolatry

'But the prophet who speaks a word presumptuously in My name which I have not commanded him to speak, or which he speaks in the name of other gods, that prophet shall die.'

Hebrew

כ אַךְ הַנָּבִיא אֲשֶׁר יָזִיד לְדַבֵּר דָּבָר בִּשְׁמִי, אֵת אֲשֶׁר לֹא-צִוִּיתִיו לְדַבֵּר, וַאֲשֶׁר יְדַבֵּר, בְּשֵׁם אֱלֹהִים אֲחֵרִים--וּמֵת, הַנָּבִיא הַהוּא.

Greek

20 πλὴν ὁ προφήτης, ὃς ἂν ἀσεβήσῃ λαλῆσαι ἐπὶ τῷ ὀνόματί μου ῥῆμα, ὃ οὐ προσέταξα λαλῆσαι, καὶ ὃς ἂν λαλήσῃ ἐπ᾿ ὀνόματι θεῶν ἑτέρων, ἀποθανεῖται ὁ προφήτης ἐκεῖνος.

• Parashah: Shoftim
• Sefer HaChinuch: 518
• Mishneh Torah: Knowledge — Idolatry and Gentile Customs

• Deuteronomy 18:20

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