“Seventy (year-) weeks have been appointed over you people and over your holy city, to restrain the apostasy and to make an end of sin, and to atone for the error, and to bring everlasting salvation, that vision and prophecy may be sealed, and the Most Holy be anointed.

Daniel 9:24-27, Zunz; see also Moffatt.

According to Daniel’s prophecy, from a certain feature in the rebuilding of the resurrected city of Jerusalem seventy “(year-) weeks” or “weeks of years” (amounting to 490 years) would count.