Matthew 23:7-11

And greetings in the markets, and to be called of men, Rabbi, Rabbi.

But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren.

And call no man your father upon the earth: for one is your Father, which is in heaven.

Neither be ye called masters: for one is your Master, even Christ.

But he that is greatest among you shall be your servant.