Revelation of Jesus Christ
From the KJV 1611 with Strong's Concordance
H5769
עוֹלָם
'owlam
{o-lawm'}
From H5956; properly concealed, that is, the vanishing point; generally time out of mind (past or future), that is, (practically) eternity; frequentative adverbially (especially with prepositional prefix) always.
NOTE: Used widely throughout the Old Testament (below are the usages from Daniel only).
everlasting
Daniel 9:24, 12:2.