Mark 10:38-40

But Jesus said unto them, Ye know not what ye ask. Are ye able to drink the cup that I drink? or to be baptized with the baptism that I am baptized with? And they said unto him, We are able. And Jesus said unto them, The cup that I drink ye shall drink; and with the baptism that I am baptized withal shall ye be baptized: but to sit on my right hand or on my left hand is not mine to give; but it is for them for whom it hath been prepared.