Mark 10:40 (KJV)

And James and John, the sons of Zebedee, come unto him, saying, Master, we would that thou shouldest do for us whatsoever we shall desire.

And he said unto them, What would ye that I should do for you?

They said unto him, Grant unto us that we may sit, one on thy right hand, and the other on thy left hand, in thy glory.

But Jesus said unto them, Ye know not what ye ask: can ye drink of the cup that I drink of? and be baptized with the baptism that I am baptized with?

And they said unto him, We can. And Jesus said unto them, Ye shall indeed drink of the cup that I drink of; and with the baptism that I am baptized withal shall ye be baptized:

And when the ten heard it, they began to be much displeased with James and John.

But Jesus called them to him, and saith unto them, Ye know that they which are accounted to rule over the Gentiles exercise lordship over them; and their great ones exercise authority upon them.

But so shall it not be among you: but whosoever will be great among you, shall be your minister:

And whosoever of you will be the chiefest, shall be servant of all.

For even the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many.