To whom did Christ become the author of salvation?

Answer

"And being made perfect, He became the author of eternal salvation unto all them that obey Him." Verse 9.

How may one know that this does not refer to the earthly sanctuary ?
What does Christ as the advocate of His people confess before the Father and His angels?
To whom was this covenant-promise later renewed?
Did Christ, while on earth, keep the Sabbath?
Of what does God say the keeping or hallowing of the Sabbath is a sign?
From what time was Christ, the Word, associated with God, the Father?
What sign was to follow the darkening of the sun and the moon?

Questions & Answers are from the book Bible Readings for the Home Circle