'Seven Spirits of God' in the Bible

"To the messenger of the church at Sardis write: 'The One who holds the seven spirits of God and the seven stars speaks as follows: "I know what you are doing; you have the reputation of being alive, but in reality you are dead.

Out from the throne came flashes of lightning, rumblings and peals of thunder, while in front of it seven flaming lamps were burning; they were the seven spirits of God.

Then I saw, midway between the throne and the four living creatures, standing among the elders, a Lamb that looked as though He had been slaughtered. He had seven horns and seven eyes; the latter are the seven spirits of God which are sent on duty to every portion of the earth.