Matthew 27:53

Jesus, as the firstborn from among the dead, was the first one resurrected to eternal life. This occurred toward the end of the weekly Sabbath. Then the next morning, Jesus fulfilled the Wave Sheaf Offering Day, when He ascended into heaven to be accepted by God the Father as the perfect sacrifice for the sin of the world. This had to have happened before any of the other dead saints could have been raised back to physical life and appear to many.