Ya'akov 4:11-12

Do not speak lashon hora against an Ach b'Moshiach. The one speaking against an Ach b'Moshiach or setting himself up as a shofet (judge) of his Ach b'Moshiach speaks against the Torah and sets himself up as shofet of the Torah. Now if the Torah you judge, you are not Shomrei HaTorah but a shofet. One is the Mekhokek (Law-Giver) and HaShofet (The Judge), the One who is able to save and to destroy. But who are you, the one who has set yourself up as the shofet of your re'a (neighbor)?