And - omitted in the two oldest manuscripts, Vulgate, Syriac.
I was, etc. - Greek, “I became in the Spirit” (see on Rev 1:10): I was completely rapt in vision into the heavenly world.
was set - not was placed, but was situated, literally, “lay.”
one sat on the throne - the Eternal Father: the Creator (Rev 4:11): also compare Rev 4:8 with Rev 1:4, where also the Father is designated, “which is, and was, and is to come.” When the Son, “the Lamb,” is introduced, Rev 5:5-9, a new song is sung which distinguishes the Sitter on the throne from the Lamb, “Thou hast redeemed us to God,” and Rev 5:13, “Unto Him that sitteth upon the throne, and unto the Lamb.” So also in Rev 5:7, as in Dan 7:13, the Son of man brought before the Ancient of days is distinguished from Him. The Father in essence is invisible, but in Scripture at times is represented as assuming a visible form.