The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
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
- 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:
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.