[Mesorah] Shaarei Yashar or Shaarei Yosher?

[Micha Berger via Mesorah]

On Mon, Aug 24, 2015 at 01:14:45PM -0400, Zev Sero via Mesorah wrote:
: On 08/24/2015 09:54 AM, Jeremy Rosenbaum Simon wrote:
: >Do we see yashar as s noun before modern Hebrew?
: 
: Yes, we do.  "Sh'mor tam, ur'ei yashar".

Which shows yashar as a variation on the same theme as tam.

Tir'u baTov!
-Micha