The High Court has rejected an application by the prosecution seeking a stay of execution against a decision last November on the return of close to RM16 million worth of assets and properties belonging to former prime minister Datuk Seri Najib Razak, his wife Datin Seri Rosmah Mansor, their son Nor Ashman Razak Najib, Rosmah's son Riza Aziz, and five others said to be related to 1Malaysia Development Bhd.