What is commandment #42 of the 613 commandments?

Commandment #42 is a negative commandment from Deuteronomy 18:20: "Do not prophesy in the name of idolatry." It belongs to the category of Idolatry.

Where is commandment #42 found in the Bible?

This commandment is found in Deuteronomy 18:20, in the book of Deuteronomy.

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Negative Commandment #42 of 613

Do not prophesy in the name of idolatry

Commandment #42 — a prohibition from Deuteronomy 18:20, classified under Idolatry in the 613 commandments of the Torah.

Scripture

“'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.'”

— Deuteronomy 18:20

Hebrew

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

Greek (Septuagint)

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.