What does John 5:28 mean?
Jesus has already referred to His power over life and death (John 5:21). Part of this power includes the ability to overcome spiritual death (John 5:24), as well as physical death (John 5:25). It also means that Jesus has the right, as God, to judge all mankind at the eventual end-times resurrection (Revelation 20:12).One reason Jesus reminds His listeners not to "marvel" at His claim is that this end-times resurrection was a common part of existing Jewish thought. Some groups, such as Sadducees, denied this (Acts 23:8). Most Jewish people, though, already understood that there would be a resurrection leading to judgment at some point in the future.
Jesus' purpose here (John 5:29) is to link this commonly accepted belief to His own ministry. The one given power and authority for resurrection and judgment is Jesus Christ. This is the role of the prophetic Son of Man (Daniel 7:13–14), a title Jesus often claims for Himself.