KJV: 22 But Jesus answered and said, Ye know not what ye ask. Are ye able to drink of the cup that I shall drink of, and to be baptized with the baptism that I am baptized with? They say unto him, We are able. 23 And he saith unto them, Ye shall drink indeed of my cup, and be baptized with the baptism that I am baptized with: but to sit on my right hand, and on my left, is not mine to give, but it shall be given to them for whom it is prepared of my Father.

NIV: 22 “You don’t know what you are asking,” Jesus said to them. “Can you drink the cup I am going to drink?” “We can,” they answered. 23 Jesus said to them, “You will indeed drink from my cup, but to sit at my right or left is not for me to grant. These places belong to those for whom they have been prepared by my Father.”

ESV: 22 Jesus answered, “You do not know what you are asking. Are you able to drink the cup that I am to drink?” They said to him, “We are able.” 23 He said to them, “You will drink my cup, but to sit at my right hand and at my left is not mine to grant, but it is for those for whom it has been prepared by my Father.”

CSB: 22 Jesus answered, “You don’t know what you’re asking. Are you able to drink the cup that I am about to drink?” “We are able,” they said to him. 23 He told them, “You will indeed drink my cup, but to sit at my right and left is not mine to give; instead, it is for those for whom it has been prepared by my Father.”

Explanation

The additional comment about the "baptism" was brought over from Mark 10:38 and 39.

NIV: 38 “You don’t know what you are asking,” Jesus said. “Can you drink the cup I drink or be baptized with the baptism I am baptized with?” 39 “We can,” they answered. Jesus said to them, “You will drink the cup I drink and be baptized with the baptism I am baptized with, 40 but to sit at my right or left is not for me to grant. These places belong to those for whom they have been prepared.”

UBS gives the omission of the words an A rating.