Revelation 1:10

10 I was in the spirit [a] on the Lord's day, and I heard behind me a loud voice like a trumpet

Revelation 1:10 In-Context

8 "I am the Alpha and the Omega," says the Lord God, who is and who was and who is to come, the Almighty.
9 I, John, your brother who share with you in Jesus the persecution and the kingdom and the patient endurance, was on the island called Patmos because of the word of God and the testimony of Jesus.
10 I was in the spirit on the Lord's day, and I heard behind me a loud voice like a trumpet
11 saying, "Write in a book what you see and send it to the seven churches, to Ephesus, to Smyrna, to Pergamum, to Thyatira, to Sardis, to Philadelphia, and to Laodicea."
12 Then I turned to see whose voice it was that spoke to me, and on turning I saw seven golden lampstands,

Footnotes 1

New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.