This might be quite a basic question, but there’s a passage from Rabbi Samson of Sens’s commentary on Mishnah Eduyot 1:5 that I’ve seen quoted in a few books eg here.
(Sometimes it’s quoted as being from Rabbi Samson’s Tosefta Sens or Tosefta Shantz, but always from Eduyot, which seems slightly odd since Eduyot is Mishnah rather than Gemara).
I can’t find this commentary anywhere, eg Shas, Hebrew Books, Responsa Project... Can anyone help nudge me in the right direction, even if it’s only available on paper would be helpful to have a title or some other information to help find it?