English colloquialism for " à pendre et à dépendre" ?

[Joel S. Berson]

I am looking for an English idiom that would
correspond to the French "à pendre et à
dépendre", which is an expression of loyalty,
that of a very devoted friend.  One literal
translation is "to hang and to spend freely"; ,
suggesting someone who's ready both to die for
you and to have a good time with you.  Is there
any neat colloquialism in English?

Joel