فإذا أخذه عاد الضمان
Translation: When he takes it back, the pledge liability returns.
The legal trigger is restored possession, not simply requesting return. Initially the pledgee had the collateral, the owner then took it temporarily, and finally the pledgee received it again. The applicable security liability follows the corresponding change in custody.
Opening interactive controls...
Original ruling: liability returns with possession
Kitab al-Rahn: Misuse, Loan Back, Liability and Death of the Pledgor
فإذا أخذه عاد الضمان
Translation: When he takes it back, the pledge liability returns.
The legal trigger is restored possession, not simply requesting return. Initially the pledgee had the collateral, the owner then took it temporarily, and finally the pledgee received it again. The applicable security liability follows the corresponding change in custody.