The travel, illness and other exemptions have their respective legal bases. Yet if an exempt person joins a valid Jumuah, that prayer suffices instead of Zuhr. Non-obligation must not be confused with invalidity.
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Why exemptions are separate from validity
Friday Prayer: Conditions, Khutbah, Congregation and Related Rulings
The travel, illness and other exemptions have their respective legal bases. Yet if an exempt person joins a valid Jumuah, that prayer suffices instead of Zuhr. Non-obligation must not be confused with invalidity.