Смерть не спросит, придет да скосит

Not a single man knows when his death hour will come, but when it does, one must die. See От смерти не уйдешь (O)

Cf: Death does not blow a trumpet (Br.). Death has (keeps) no calendar (Am.). Death observes no ceremony (Am.). Death waits for no one (Am.). Death when it comes will have no denial (Br.). God comes to see us without a bell (Br.). There is nothing so certain as death and nothing so uncertain as the hour of death (Br.). There is no way of knowing when death will come; it just does (Am.)