Revelation of Jesus Christ
From the KJV 1611 with Strong's Concordance
H8064
שָׁמַיִם
shamayim
{shaw-mah'-yim}
The second form being dual of an unused singular; from an unused root meaning to be lofty; the sky (as aloft; the dual perhaps alluding to the visible arch in which the clouds move, as well as to the higher ether where the celestial bodies revolve).
NOTE: Used widely throughout the Old Testament (below are the usages from Daniel only).
heaven
Daniel 8:8, 8:10; 9:12; 11:4; 12:7.