Rev.1.8  "I am the Alpha and the Omega," says the Lord God, who is and who was and who is to come, the Almighty.
Rev.21.6  And he said to me, "It is done! I am the Alpha and the Omega, the beginning and the end. To the thirsty I will give from the fountain of the water of life without payment.
Rev.22.13  I am the Alpha and the Omega, the first and the last, the beginning and the end."

Hyper-concordance v1.1, by Sean Boisen. Scripture verses taken from the Revised Standard Version, copyright 1952, 1971.