Mark 10:38-40

But Jesus said to them, “You do not know what you are asking. Are you able to drink the cup that I drink, or to be baptized with the baptism with which I am baptized?” They said to Him, “We are able.” And Jesus said to them, “The cup that I drink you shall drink; and you shall be baptized with the baptism with which I am baptized. But to sit on My right or on My left, this is not Mine to give; but it is for those for whom it has been prepared.”