be for

be (all) for (someone or something)

To support a person, group, or effort. If management is considering adding a gym to the building, I'm all for it! I respect your opinion, but I'm for the other candidate.

be for someone or something

 and be for doing something
supporting or in favor of someone or something. I'm for abandoning the scheme. Mary is running for office, and the whole family is for her.

be for

v.
To be in favor of something or someone: I'm definitely not for cutting down the trees; we need the shade. Are you for these candidates, or against them?
References in classic literature ?
But the fact is, that being, as I am, to inherit this estate after the death of your honoured father (who, however, may live many years longer), I could not satisfy myself without resolving to choose a wife from among his daughters, that the loss to them might be as little as possible, when the melancholy event takes place-- which, however, as I have already said, may not be for several years.
May I succeed, if to succeed be for my good and yours, or likely to avail me in my cause