'Spirits' in the Bible

Are they not all helping spirits, who are sent out as servants to those whose heritage will be salvation?

And again, if the fathers of our flesh gave us punishment and had our respect, how much more will we be under the authority of the Father of spirits, and have life?

To the great meeting and church of the first of those who are named in heaven, and to God the judge of all, and to the spirits of good men made complete,