An Aramaic expression used in e.g. Dan. 7: 9 for God as Judge. It conveys the notion of wisdom associated by the Jews with old age.
Citation for Ancient of Days
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"Ancient of Days." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 25, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e2103>.
Chicago
"Ancient of Days." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e2103 (accessed May 25, 2013).