Revelation 10:4

And, when the seven thunders spake, I was about to write; and I heard a voice out of Heaven, saying, "Seal up the things which the seven thunders spake, and write them not."

Revelation 1:11

saying, "What you see, write in a book, and send it to the seven assemblies; to Ephesus, and to Smyrna, and to Pergamum, and to Thyatira, and to Sardis, and to Philadelphia, and to Laodicea."

Revelation 22:10

And he says to me, "Seal not up the words of the prophecy of this book; for the time is at hand.

Revelation 2:1-3

"To the angel of the assembly in Ephesus write these things," saith He Who holdeth the seven stars in His right hand, He Who walketh in the midst of the seven golden candlesticks:

Treasury of Scripture Knowledge

Summary

And when the seven thunders had uttered their voices, I was about to write: and I heard a voice from heaven saying unto me, Seal up those things which the seven thunders uttered, and write them not.

Bible References

I was

Revelation 1:11
saying, "What you see, write in a book, and send it to the seven assemblies; to Ephesus, and to Smyrna, and to Pergamum, and to Thyatira, and to Sardis, and to Philadelphia, and to Laodicea."