'Seven Spirits of God' in the Bible

"And to the angel of the assembly in Sardis write these things," saith He Who hath the seven Spirits of God and the seven stars: "I know your works, that you have a name that you are living, and you are dead.

And out of the throne proceed lightnings and voices and thunderings; and there were seven lamps of fire 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 if slain, having seven horns and seven eyes, which are the seven Spirits of God, sent forth into all the earth.