The dative is used with verbs compounded with σύν (regularly), with many compounded with ἐν, ἐπί, and with some compounded with παρά, περί, πρός, and ὑπό, because the preposition keeps a sense that requires the dative.
ἐλπίδας ἐμποιεῖν ἀνθρώποις
αὐτοῖς ἐπέπεσε τὸ Ἑλληνικόν
οὗτοι οὐ παρεγένοντο βασιλεῖ
ὑποκεῖσθαι τῷ ἄρχοντι
a. So especially with verbs of motion and rest formed from ἰέναι, πί_πτειν, τιθέναι, τρέχειν, εἶναι, γίγνεσθαι, κεῖσθαι, etc.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].