Mark 10:38-40

But Jesus said to them, “You do not know what you ask. Are you able to drink the cup that I drink, and be baptized with the baptism that I am baptized with?” They said to Him, “We are able.” So Jesus said to them, “You will indeed drink the cup that I drink, and with the baptism I am baptized with you will be baptized; but to sit on My right hand and on My left is not Mine to give, but it is for those for whom it is prepared.”