But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren. (Matthew 23:8)
Those who followed Christ were to consider themselves equals. None was to exercise authority over another, and certainly not in matters of conscience.
Textual evidence favors the omission (cf. p. 146) of these words.
The “ye” is emphatic in the Greek. Probably an admonition to the disciples. They were not to assume an authoritarian role in matters of theology.