The Armorer, Paz Viszla and others in “Chapter 5: Return of the Mandalorian”

It is done. Paz Vizsla, have you ever removed your helmet?

No.

Has it ever been removed by others?

Never.

This is The Way.

This is The Way.

Din Djarin, have you ever removed your helmet? [notices Mando's silence] Have you ever removed your helmet? By Creed, you must vow.

I have.

Then, you are a Mandalorian no more.

I beg you for your forgiveness. How can I atone?

Leave, apostate.

According to Creed, one may only be redeemed in the living waters beneath the mines of Mandalore.

But the mines have all been destroyed.

This is The Way.