What is the scope of the obligation if a person says, 'Perform Hajj on my behalf' without specifying the number of times?

Primary text

If one says, 'Perform Hajj on my behalf' (*Hajju 'anni*) without specifying 'a single Hajj' (*hajjatan wahidatan*), only one Hajj is performed on their behalf, as that is the minimum amount to which the term applies.