Herbert Weir Smyth, A Greek Grammar for Colleges

a. Genitive or dative when the expression of desire is addressed to a person and the genitive or dative depends on the leading verb. Here the sentence is simple. Thus, ““δέομαι ὑ_μῶν . . . τὰ δίκαια ψηφίσασθαι” I ask you to render a just verdict” I. 19.51, ““τοῖς ἄλλοις πᾶσι παρήγγελλεν ἐξοπλίζεσθαι” he ordered all the rest to arm themselves” X. A. 1.8.3.

b. Accusative when the action of a person is desired (example in 1979). Such sentences are complex.

N.—Verbs of commanding allow either a or b; but only κελεύω with the accusative permits either meaning: κελεύω σὲ ταῦτα μὴ ποιει_ν I tell you not to do this and I command that you shall not do this. Cp. 1981.