Allen and Greenough's New Latin Grammar, section 379

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379.

The Dative of Reference is used idiomatically without any verb in colloquial questions and exclamations: -

quó mihi fortúnam (Hor. Ep. i. 5. 12), of what use to me is fortune?
unde mihí lapidem (Hor. S. ii. 7. 116), where can I get a stone?
quó tibi (id. i. 6. 24), what use for you, Tillius?

a. The dative of reference is sometimes used after interjections:

ei (hei) mihi (Aen. ii. 274), ah me!
vae victís (Liv. v. 48), woe to the conquered.
em tibi, there, take that (there for you)! [Cf. § 380.]

NOTE: To express FOR - meaning instead of, in defence of, in behalf of - the ablative with pró is used: -

pró patriá morí (Hor. Od. iii. 2. 13), to die for one's country.
ego íbó pró té (Plaut. Most. 1131), I will go instead of you.