First case: The ruling concerning Hajj remains established, but an unforeseen calamity prevents its performance in a given year. That circumstance does not abolish the Hajj ruling.
Second case: The ruling concerning jihad remains established, but no fighting occurs during a particular period. Non-occurrence does not repeal the underlying ruling.
Conclusion: A religious duty's continuing legal status and its actual performance at a particular time are separate matters. This distinction explains the persistence described in the passage.