Authors:

Understand that Bluestar does not make this offer lightly if you wish to train with us, we will have to take you into our Clan. You must either live with us and respect our ways, or return to your Twolegplace and never come back. You cannot live with a paw in each world.

Erin Hunter (2015). “Warriors 6-Book Collection with Bonus Book: Enter the Clans: Books 1-6 Plus Enter the Clans”, p.20, HarperCollins
Understand that Bluestar does not make this offer lightly if you wish to train with us, we will have to take you into our Clan. You must either live with us and respect our ways, or return to your Twolegplace and never