It was the title of a 1920 book in which Rutherford claimed that the OT patriarchs would be resurrected in 1925.
First, he claimed that God commanded the Israelites to enter Canaan in 1575 B.C. and that every 50 years was to a Jubilee year (Leviticus 25).
He said that other scriptures (Jer. 25:11; 2 Chr. 36:17-21) show that there were to be 70 Jubilee cycles "at which time the type ends and the great antitype must begin... [which] must mark the beginning of restoration of all things." This meant the resurrection of Abraham, Isaac, and Jacob and other OT worthies and the establishment of God's kingdom.
70 cycles @ 50 years = 3500 years.
1575 B.C. + 3500 years = 1925 A.D., so millions of people now living (i.e. in 1920 (date of the book)) would never die!
What could be more clear?