The Infinite Tsukuyomi does not affect Hashirama, Tobirama, Hiruzen and Minato because they are reanimated. Hagoromo, the Sage of the Six Paths, appears and explains to the four that Hashirama and Madara are the reincarnations of his sons Ashura and Indra. Hagoromo recounts the tale of how he founded Ninshu, the Ninja Creed, and about the lives of Ashura and Indra.
But at the time, I didn't realize
لكن حينها، لم أدرك أنّ هناك قوّةً ظلامية
...تتحرّك بالفعل محاولةً التلاعب بولديّ
Aber damals bemerkte ich nicht,
Pero en ese entonces,
no me había dado cuenta
Pero en aquel entonces,
no me había dado cuenta
Purtroppo a quel tempo, 
non mi ero ancora reso conto
Naquela época, eu não percebi...