НАШЕ ДЕЛО ТЕЛЯЧЬЕ
obey someone else's orders and nothing depends on me. See Хозяин - барин (X) Var.: Наше дело - сторона /, поел да в закут/
Cf: Orders must not be challenged (
Am.). Ours is not to question why, ours is to do or die (
Br.). Yours is not to question why; yours is but to do or die (
Am.)