Whom do you ask is correct.
It is a matter of subjects and objects. Who is used grammatically as a subject when a nominative pronoun such as I or he can be used. Whom is the object of a preposition or a verb.
Think about it this way: which one is performing the action? Remember, the example sentence is a question, so is flipped around. If you were to make it a statement, ir might read instead, You ask whom.
I could bore you with a diagram of the sentence, but that wouldn't really help much. Think about who is performing the action (The subject predicates the object--You is doing the asking; whom is being asked.)
Who are you
Do not as for whom the bell tolls for, It tolls for thee
They ask friends and people in the business world whom they know and respect.
The correct way to ask that question would be: "From whom was it?"
To identify the indirect object in a sentence, you can ask "to whom?" or "for whom?" after the verb to determine who is receiving the action indirectly.
Whom did you say was coming for dinner? Ask not for whom the bell tolls; it tolls for thee. The landlord from whom he was renting had suddenly passed away.
en expert
Scout
the muse
Ask him
1000 or 1024, depending on whom you ask.
A physician or pharmacist.