Mattityahu 23:7-9

Orthodox Jewish Bible

⁷ And the [obsequious] Birkat Shalom greetings in the market places, and to be called by Bnei Adam, Rebbe.

⁸ But you are not to have pretentious titles like Rebbe, for One is your Rebbe [Rebbe Melech HaMoshiach], and all of you are Achim b’Moshiach.

⁹ And do not refer to anyone in the Olam Hazeh as your Abba, for One is your Av shbaShomayim.