Matthew
Matthew 23:8ESV·traditional attribution

But you are not to be called rabbi, for you have one teacher, and you are all brothers.

John Gill Reformed Baptist @doctorgill

But be not ye called Rabbi,.... Do not be ambitious of any such title, fond of it, or affect it, or be elated with it, should it be given you; nor look upon yourselves as men of power and authority over others; as having the dominion over men's faith, a power to make laws for others, impose them in a magisterial way, and bind and...

Albert Barnes Presbyterian @notesbybarnes

Verse 8. Be not ye, etc. Jesus forbade his disciples to seek such titles of distinction. The reason he gave was, that he was himself their Master and Teacher. They were on a level; they were to be equal in authority; they were brethren; and they should neither covet nor receive a title which implied either an elevation of one above another, or which appeared...

Jamieson-Fausset-Brown Reformed @jfbcommentary

But be not ye called Rabbi; for one is your Master--your Guide, your Teacher.