first hokage saw the rinnegon before.

[redwind]

because he knows about renni tensei he knew what madara was doing to obito
in chapter 637.

 

[~Sasuke~]

Obviously...

 

[Akasha]

Cool story bro!

 

[Imperfect]

Stone Tablet of the Sage, in the Uchiha Shrine.

Madara showed him it, and might have explained the technique off screen (well... page).

But I don't think the Rinnegan has been seen since the Sage and then after Nagato. Madara's was hidden until Nagato.

 

[redwind]

okay but how did he know it was the rinni tensei then if he only read it off of the table he must have seen it in his life time before maybe we'll find out if he did or not you never know

 

[Silverblade]

Rinne Tensei.

The jutsu that inspired Edo Tensei.

 

[SIR HERDERP PRESIDERP SDO]

Possibly from the Scroll of Seals (owned by Mito & the Uzumaki Clan)

 

[kunde]

he deciphered uchiha tablet more than wat oro did ..dats hw he knows RTZzz

 

[Kronnic]

I don't think he have seen it personally, he probably heard/read about it from the scroll.. Unless he was alive in the time of the Sage I would say No and maybe Kishi screwed up.
Madara got them when he was about to die and Hashi died before Maddy.

 

[Naruto5octobre]

I think from mito there must be an uzumaki secret tablet or something like that