The Sabbath rest in the following passage from Hebrews
seems to be referring to the rapture.  A day being as
a thousand years, God rested at the seventh day of
creation and we, who are His, are promised a Sabbath
rest presumably at the end of the six thousand years,
the beginning of the seventh millenia.
 

Hebrews 4

The Promise of Rest

Be Sure to Enter the Promised Rest
1 Therefore, since a promise remains of entering His
rest, let us fear lest any of you seem to have come
short of it. 2For indeed the gospel was preached to us
as well as to them; but the word which they heard did
not profit them, not being mixed with faith in those
who heard it. 3For we who have believed do enter that
rest, as He has said:
        "So I swore in My wrath,
        "They shall not enter My rest,"'

although the works were finished from the foundation
of the world. 4For He has spoken in a certain place of
the seventh day in this way: "And God rested on the
seventh day from all His works"; 5and again in this
place: "They shall not enter My rest."
6Since therefore it remains that some must enter it,
and those to whom it was first preached did not enter
because of disobedience, 7again He designates a
certain day, saying in David, "Today," after such a
long time, as it has been said:

        "Today, if you will hear His voice,
        Do not harden your hearts."

8For if Joshua had given them rest, then He would not
afterward have spoken of another day. 9There remains
therefore a rest for the people of God. 10For he who
has entered His rest has himself also ceased from his
works as God did from His.

The Word Discovers Our Condition
11 Let us therefore be diligent to enter that rest,
lest anyone fall according to the same example of
disobedience.
 

There is a tie-in to Sabbath rest and Rosh Hoshannah,
which occurs on the first day of the seventh month, as
well as Feast of Tabernacles which is about two weeks
later, in these Old Testament verses:
 

Leviticus 23:24
"Speak to the children of Israel, saying: "In the
seventh month, on the first day of the month, you
shall have a sabbath-rest, a memorial of blowing of
trumpets, a holy convocation.

Leviticus 23:39
"Also on the fifteenth day of the seventh month, when
you have gathered in the fruit of the land, you shall
keep the feast of the LORD for seven days; on the
first day there shall be a sabbath-rest, and on the
eighth day a sabbath-rest.
 

Perhaps this is another hint of the timing of the
promise of a Sabbath rest, or rapture, being tied to
Rosh Hoshannah.  Feast of Tabernacles also promises a
Sabbath rest with a 7-day feast.  This could correlate
to a 7-year time period simultaneous with the 7-year
tribulation on Earth.