to whom it may concern
Cliché to the person to whom this applies. (A form of address used when you do not know the name of the person who handles the kind of business you are writing about.) The letter started out, "To whom it may concern." When you don't know who to write to, just say, "To whom it may concern."
Whom the gods love die young.
Prov. Virtuous or gifted people die at an early age, because the gods want those people to be with them in the afterlife. So many brilliant authors and artists died before the age of fifty that it's easy to believe that whom the gods love die young.
With whom do you wish to speak?
a polite phrase used by people who answer the telephone to find out whom the caller wants to speak to. (Compare this with Who do you want to talk to?) John answered the telephone and then said, "With whom do you wish to speak?" Tom (answering the phone): Good morning, Acme Air Products. With whom do you wish to speak? Sue: Sorry, I have the wrong number. Tom: That's perfectly all right. Have a nice day.