34 Here καί (kai) has been translated as “then” to indicate the implied sequence of events within the vision.
35 Several key (𝔓47 א1 A 0207 1611 2053 2344 lat syh co) lack the word τεσσάρων (tessarōn, “four”) before κεράτων (keratōn, “horns”). The word seems to have been added by scribes because a “horned” altar (described in the OT [Exod 30:2, 10]) could have only four “horns” or projections at the corners. includes the word in brackets, indicating doubts as to its authenticity.

In other versions

Then the sixth angel blew his trumpet, and I heard a voice from the four horns of the golden altar before God,

The sixth angel sounded his trumpet, and I heard a voice coming from the four horns of the golden altar that is before God.

The sixth angel blew his trumpet. From the four horns of the golden altar that is before God, I heard a voice

Then the sixth angel blew his trumpet, and I heard a voice speaking from the four horns of the gold altar that stands in the presence of God.

And the sixth angel blew the trumpet, and I heard one voice from the horns of the golden altar that is before God

And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,

Public Domain