Depending on what the OP mean by "original", these could very well be the Mac guidelines from 1984, which significantly predate NeXT's (which were also heavily inspired by the work of the Mac team for obvious reasons).
video from 1982
https://www.youtube.com/watch?v=Cn4vC80Pv6Q
that notoriously Steve Jobs saw and copied for the Lisa?
> which were also heavily inspired by the work of the Mac team for obvious reasons
[citation needed]