Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 285
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 285, with English translation by Maimonides (Rambam).
שלא להעיד בשקר, שנאמר "לֹא תַעֲנֶה בְּרֵעֲךָ עֵד שָׁקֶר" (שמות כ, יב).
Not to give false testimony, as [Exodus 20:13] states: "Do not give false testimony against your neighbor."