Then Jesus spoke to the crowds and to his disciples, saying, "The scribes and the Pharisees have taken their seat on the chair of Moses. Therefore, do and observe all things whatsoever they tell you, but do not follow their example. For they preach but they do not practice. They tie up heavy burdens (hard to carry) and lay them on people's shoulders, but they will not lift a finger to move them. All their works are performed to be seen. They widen their phylacteries and lengthen their tassels. They love places of honor at banquets, seats of honor in synagogues, greetings in marketplaces, and the salutation 'Rabbi.' As for you, do not be called 'Rabbi.' You have but one teacher, and you are all brothers. Call no one on earth your father; you have but one Father in heaven. Do not be called 'Master'; you have but one master, the Messiah. The greatest among you must be your servant. Whoever exalts himself will be humbled; but whoever humbles himself will be exalted. (Mt 23:1-12)
Jesus is talking to the disciples and the crowds. The disciples and the crowds do belong to those who follow him. The disciples follow him closely: they live with him and work with him. The crowds do follow him but not so closely like the disciples. These are opposed to scribes and Pharisees. The scribes and Pharisees preach similar principles but they do not follow them.
The scribes and Pharisees are leaders. As leaders they present the crowds with lots of rules, regulations, and traditions. But they themselves do not practice those rules etc. They multiply external practices. They believed that the external practices will reveal the internal dispositions. But in their cases the externals only revealed the internal pretentions.
Followers of Jesus should all be brothers. They should all belong to one family to which God is the only father and they do not impose rules on others and play the role of a master. There is only one teacher and that is Jesus the Messiah. Service is the only way to express all these. Service to the other is the only thing that links the followers of Jesus with one another.
