Thus the heavens and the earth were finished,
and all the host of them.
Vs.1
"Our Latin rendering of the text before us is "and all the adornment 
of
them."
In the original Hebrew the expression is ZEBAAM, the "host" or
"army" of them.
The prophets have retained this same form of speaking
and of calling the stars and the planets, "the host or army of
heaven," as Jer. 19:13, where the Jews are represented as having
adored "all the host of heaven."
And God says by the prophet
Zephaniah, "I will cut off them that worship the host of heaven upon
the housetops." In the same manner also Stephen testifies concerning
the children of Israel in the wilderness that God "gave them up to
worship the host of heaven," Acts 7:42."
And on the seventh day God ended his work which he had made; and he
rested on the seventh day
from all his work which he had made.
Vs.2
as not to have any further design of creating any other heaven and earth.
It does not signify that God ceased to preserve and govern the
heaven and the earth, which he had now created and finished."
And God blessed the seventh day, and sanctified it:
because that in it
he had rested from all his work
which God created and made.
Vs.3
"God did
sanctify to himself the seventh day. 
This was especially designed of
God, to cause us to understand that the "seventh day" is to be
especially devoted to divine worship.
For that which is appropriated
to God and exclusively separated from all profane uses is sanctified
or holy.
-*-*-It follows therefore from this passage, that if Adam had stood in his
innocence and had not fallen he would yet have observed the seventh
day as sanctified, holy and sacred;
that is, he would have taught his
children and posterity on that day concerning the will and worship of
God."
Martin Luther