John Mark
Mark 10:40BSB·traditional attribution

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

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. Christ's prediction of his own sufferings; this string he harped much upon, though in the ears of his disciples it sounded very harsh and unpleasing. 1. See here how bold he was; when they were going up to Jerusalem, Jesus went before them, as the captain of our salvation, that was now to be made perfect through sufferings, Mar 10:32.

Commenting on Mark 10:32-45

John Gill Reformed Baptist @doctorgill

But so shall it not be among you,.... Or "so let it not be", as in many copies; or as the Persic version renders it, "it ought not to be so among you"; such a lordly spirit does not become you; this is heathenish: but whosoever will be great among you shall be, as in Matthew "let him", Mat 20:26, be your minister.

Adam Clarke Methodist @methodicalclarke

Is not mine to give - See on Mat 20:23 (note).