'Seven Spirits of God' in the Bible

And to the angel of the church in Sardis write, These things says he that has the seven spirits of God and the seven stars, I know your works, that you have a name to live, and are dead.

And there proceeded from the throne lightnings and voices and thunders; and seven lamps of fire were burning before the throne, which are the seven spirits of God,

And I saw in the midst of the throne and of the four cherubs and in the midst of the elders, a lamb standing as if killed, having seven horns and seven eyes, which are the seven spirits of God sent into all the earth.