The passage in question comes near the end of the Gospel According to Matthew, Chapter 27, verses 52-53. The context is the events that take place in Jerusalem immediately after Jesus's death:
-  . . . yielded up the ghost.
-  And, behold, the veil of the temple was rent in twain from the top to the bottom; and the earth did quake, and the rocks rent.
-  And the graves were opened, and many bodies of the saints which slept arose.
-  And came out of the graves after his resurrection, and went into the holy city, and appeared unto many.
So, next time there's a zombie parade in town -- which, frighteningly enough, is an annual occurrence in these parts** -- I wanna see 'ZOMBIES FOR CHRIST' t-shirts out there in the crowd. It's only fair.
*I'm about a third of the way through THE BOOK OF MORMON, myself -- but then, I'm doing them as audiobooks
**better known as the Fremont Zombie Walk.