Infinitive in Commands.—The infinitive may be used for the second person of the imperative. The person addressed is regarded as the subject. This infinitive is commoner in poetry than in prose (where it has a solemn or formal force).
θαρσῶν νῦν, Διόμηδες, ἐπὶ Τρώεσσι μάχεσθαι
a. This infinitive may be used in conjunction with an imperative:
ἀκούετε λεῴ· κατὰ τὰ πάτρια τοὺς χόας πί_νειν
b. The infinitive for the third person of the imperative often occurs in legal language (laws, treaties, etc.), and does not necessarily depend on the principal verb. Thus,
ἔτη δὲ εἶναι τὰ_ς σπονδὰ_ς πεντήκοντα
c. The infinitive (with subject accusative) is rarely used for the third person of the imperative when there is an unconscious ellipsis of a word like δός
d. In negative commands (prohibitions) μή with the infinitive is poetic and Ionic: οἷς μὴ πελάζειν
μηδὲ καλεῖν πω ὄλβιον
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].