go through fire and water

Literally, the names mean they’ll go through fire and water together.

Go through fire and water in response to the Party's call!

For example, I asked him that when Pamina and Tamino go through fire and water there should be real danger; in most productions, it feels like a symbolic, pleasant walk.

“I will go through fire and water for my friend” was a common expression in the middle ages, and, though having lost its original significance, the saying has persisted to the present time as a declaration of self-sacrifice.

Yet he was a faithful fellow, and would any day go through fire and water to oblige us.