A.T. Robertson Commentary Luke 22:26

"But ye [shall] not [be] so: but he that is the greater among you, let him become as the younger; and he that is chief, as he that doth serve." — Luke 22:26 (ASV)

Become (γινεσθω). Present middle imperative of γινομα. Act so. True greatness is in service, not in rank.