Mark 10:35-40

35And there come to him James and John, the sons of Zebedee, saying [to him], Teacher, we would that whatsoever we may ask thee, thou wouldst do it for us.

36And he said to them, What would ye that I should do for you?

37And they said to him, Give to us that we may sit, one on thy right hand, and one on thy left hand, in thy glory.

38And Jesus said to them, Ye do not know what ye ask. Are ye able to drink the cup which I drink, or be baptised with the baptism that I am baptised with?

39And they said to him, We are able. And Jesus said to them, The cup that I drink ye will drink and with the baptism that I am baptised with ye will be baptised,

40but to sit on my right hand or on my left is not mine to give, but for those for whom it is prepared.