Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 16
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 16, with English translation by Maimonides (Rambam).
שלא להסית אדם מישראל אחר עבודה זרה, שנאמר במסית "ולא יוסיפו לעשות" (דברים יג,יב).
Not to act as a missionary [mesit] to persuade an individual Jew to worship false gods, as [Deuteronomy 13:12] states with regard to such missionaries: "And they shall not continue to do so."