Matthew 23:10

Neither be ye called masters - That is, leaders, guides, for this is the literal meaning of the word. It refers to those who go before others; who claim, therefore, the right to direct and control others. This was also a title conferred on Jewish teachers.

Neither of these commands forbids us to give proper titles of civil office to men, or to render them the honor belonging to their station, Matthew 22:21; Rom 13:7; 1 Peter 2:17. They prohibit the disciples of Jesus from seeking or receiving mere empty titles, producing distinctions among themselves, implying authority to control the opinions and conduct of others, and claiming that others should acknowledge them to be superior to them.