Only the Father sets up the seating arrangement (Mt 20:23-20:23)

“He said to them.

‘You will indeed drink

My cup.

But to sit

At my right hand

And at my left hand is

Not mine to grant.

It is for those

For whom

It has been prepared

By my Father.’”

 

λέγει αὐτοῖς Τὸ μὲν ποτήριόν μου πίεσθε, τὸ δὲ καθίσαι ἐκ δεξιῶν μου καὶ ἐξ εὐωνύμων οὐκ ἔστιν ἐμὸν τοῦτο δοῦναι, ἀλλ’ οἷς ἡτοίμασται ὑπὸ τοῦ Πατρός μου.

 

There is something similar to this in Mark, chapter 10:38-39, but slightly different.  Jesus said to the two sons of Zebedee (λέγει αὐτοῖς), James and John, that they would indeed drink of the suffering cup of Jesus (Τὸ μὲν ποτήριόν μου πίεσθε).  Once again, as in the previous verse, the Greek Orthodox text and the corresponding Mark text had a comment about undergoing a baptism that he was going to suffer (καὶ τὸ βάπτισμα ὃ ἐγὼ βαπτίζομαι βαπτισθήσεσθε).  However, as to sitting at the right hand (τὸ δὲ καθίσαι ἐκ δεξιῶν μου) and the left hand of Jesus (μου καὶ ἐξ εὐωνύμων), he said that he had no control over that (οὐκ ἔστιν ἐμὸν τοῦτο δοῦναι).  All that was prepared by the heavenly Father who made ready for those whom he had chosen (ἀλλ’ οἷς ἡτοίμασται ὑπὸ τοῦ Πατρός μου).  Jesus said that he could not grant this request because he was not the decision maker about heavenly seating arrangements.