Parshas Ki Tsetzse
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(A Wayward and Rebbelious son-a ben sorrer v’ morer) It was never and it never will be.
(Sanhedrin 71A)
The Arizal says that the Yidden keep all the Mitzvos in this world (Olam Hazeh) physically, so in the future(Le osid Lovo) they will keep all the Mitzvos spiritually-as this Mitzva never occurred (as the conditions mentioned in Sanhedrin are impossible to attain), this Mitzva will not physically be able to be kept in this world therefore spiritually it will not be able to be kept in Le Osid Lovo.
(Ben Yehoyoda)