'Seven Spirits of God' in the Bible

"And to the angel of the church in Sardis write: "This is what the one who has the seven spirits of God and the seven stars says: 'I know your works, that you have a name that you are alive, and you are dead.

And from the throne came out lightnings and sounds and thunders, and seven torches 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 living creatures and in the midst of the elders a Lamb standing as though slaughtered, having seven horns and seven eyes, which are the seven spirits of God sent into all the earth.