An expression applied to Jehovah three times in the vision of Daniel (7:9, 13, 22) in the sense of eternal. In contrast with all earthly kings, his days are past reckoning.
Ancient of Days
Daniel is shown a throne scene in a night vision. Thrones are set, and “the Ancient of days did sit, whose garment was white as snow, and the hair of his head like the pure wool.” His throne is like flame, with wheels of burning fire. Then one “like the Son of man” comes with the clouds of heaven and is brought near before him. Later the Ancient of days comes, judgment is given to the saints of the most High, and they possess the kingdom. The title appears only in Daniel 7, and it paints God as eternal, dignified and the final judge. Christians read the vision with Jesus in mind, and Jews read it in other ways.
3 verses
Daniel
Daniel 7:9
I beheld till the thrones were cast down, and the Ancient of days did sit, whose garment was white as snow, and the hair of his head like the pure wool: his throne was like the fiery flame, and his wheels as burning fire.
Daniel 7:13
I saw in the night visions, and, behold, one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him.
Daniel 7:22
Until the Ancient of days came, and judgment was given to the saints of the most High; and the time came that the saints possessed the kingdom.
From Easton's Bible Dictionary
Matthew George Easton, 1897