Mark 10:40
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 — the right and left seats in glory are not in Jesus' authority to assign — they are prepared by the Father for those for whom they are prepared. The answer deflects the request without denying the reality of the kingdom's glory: the glory is real, the seats are real, but they are the Father's to assign, not Jesus' to distribute in response to requests.