'Salvation' in the Bible

Aren't they all serving spirits, sent out to do service for the sake of those who will inherit salvation?

how will we escape if we neglect so great a salvation -- which at the first having been spoken through the Lord, was confirmed to us by those who heard;

For it became him, for whom are all things, and through whom are all things, in bringing many children to glory, to make the author of their salvation perfect through sufferings.

Having been made perfect, he became to all of those who obey him the author of eternal salvation,

But, beloved, we are persuaded of better things for you, and things that accompany salvation, even though we speak like this.

so Christ also, having been offered once to bear the sins of many, will appear a second time, without sin, to those who are eagerly waiting for him for salvation.