The Saints Who Had Fallen Asleep

"At that moment the curtain of the temple was torn in two, from top to bottom. The earth shook, and the rocks were split. The tombs were also opened, and many bodies of the saints who had fallen asleep were raised. After his resurrection they came out of the tombs and entered the holy city and appeared to many." — Matthew 27:51-53

I have always thought that this passage was just so, so cool. The first time I heard this after having learned about the general resurrection, I was shocked. It's eschatologically problematic to have dead people walking around before the end times. I've never read a commentary on this passage, and I know that this particular part is unique to Matthew's Gospel, but what else could this possibly be than a graphic foretaste of the coming resurrection of the body? Jesus' own resurrection was in and of itself a prefiguration of the general resurrection—"for as all die in Adam, so all will be made alive in Christ" (1 Corinthians 15:22)—but, as if the point needed to be driven home further still, here we have regular people getting up out of the grave. So all will be made alive.