When does the Zakah obligation arise if assets were mixed during the year?

Primary text

If assets are mixed during the year (*Hawl*), when the *Hawl* of the first owner is complete, the obligation is one sheep (*Shāh*) upon him. When the *Hawl* of the second owner is complete, the Zakah of partnership (*Zakāt al-Khilṭah*) becomes due, based on the previously detailed specifications.