1 Corinthians 15:20

But now is Christ risen - On the contrary, Christ is raised from the dead, and is become the first fruits of them that slept. His resurrection has been demonstrated, and our resurrection necessarily follows; as sure as the first fruits are the proof that there is a harvest, so surely the resurrection of Christ is a proof of ours. The Judaizing teacher at Corinth would feel the force of this observation much sooner than we can, who are not much acquainted with Jewish customs. "Although," says Dr. Lightfoot, "the resurrection of Christ, compared with some first fruits, has very good harmony with them; yet especially it agrees with the offering of the sheaf, commonly called עומר omer , not only as the thing itself, but also as to the circumstances of the time. For first there was the passover, and the day following was a Sabbatic day, and on the day following that the first fruits were offered. So Christ, our passover, was crucified: the day following his crucifixion was the Sabbath, and the day following that, He, the first fruits of them that slept, rose again. All who died before Christ, and were raised again to life, died afterwards; but Christ is the first fruits of all who shall be raised from the dead to die no more."