Mark 10:40

But to sit at My right or left is not Mine to grant. These seats belong to those for whom they have been prepared.”

Note Literally Mine to grant, but for whom

But to sit on my right hand and on my left hand is not mine to give; but it shall be given to them for whom it is prepared.

but to sit at my right hand and at my left hand is not mine to give, but for whom it has been prepared.”

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.