Contradiction with Exodus 33:20
God stated that no one could see His face and live, which contradicts the vivid description of His appearance in Revelation 4:3.
Exodus 33:20: And he said, Thou canst not see my face: for there shall no man see me, and live.
Contradiction with John 1:18
John declares that no one has seen God, yet Revelation 4:3 gives a descriptive image of God on His throne.
John 1:18: No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared [him].
Contradiction with 1 Timothy 6:16
It mentions God dwelling in unapproachable light, whom no one has seen or can see, which seems at odds with the visibility in Revelation 4:3.
1 Timothy 6:16: Who only hath immortality, dwelling in the light which no man can approach unto; whom no man hath seen, nor can see: to whom [be] honour and power everlasting. Amen.