Kyu Seop Kim. "The Concept of διαθήκη in Hebrews 9.16–17." Journal for the Study of the New Testament 43.2 (2020): 248–65.
"Many exegetes assume that wills were of immediate effect when they were written and that it was common in Graeco-Roman society to transfer the unrestricted ownership of property to heirs regardless of the testators’ death. However, these assumptions are not sustainable when we explore actual testamentary practices in ancient society. In documentary papyri, the transfer of patrimonum rarely took place during the lifetime of the testator, and the death of the testator was conditio sine qua non for the efficacy of the testament. These aspects lead the reader to a new understanding of Christ’s death in Heb. 9.16-17."