We've never seen anything like this ... ever.
BJ Penn is getting a SERIOUS offer from the man he's supposed to fight in October -- with Nik Lentz telling TMZ Sports he wants Penn to come live and train with him to help get his life back on track.
Remember, Dana White said Penn's last ever UFC fight would be against Lentz later this year -- but after Penn was KO'd during a street fight in Hawaii, it seems the bout could be in jeopardy.
Lentz tells us he "needs" this fight to happen for the sake of his own family -- but also he cares about Penn and wants to help him get cleaned up.