Middle voice from pros and kaleo; to call toward oneself, i.e. Summon, invite -- call (for, to, unto).
see GREEK pros
see GREEK kaleo
b. metaphorically, God is said προσκαλεῖσθαι the Gentiles, aliens as they are from him, by inviting and drawing them, through the preaching of the gospel, unto fellowship with himself in the Messiah's kingdom, Acts 2:39; the Holy Spirit and Christ are said to call unto themselves (cf. Winer's Grammar, § 39, 3) those preachers of the gospel to whom they have decided to intrust a service having reference to the extension of the gospel: followed by an infinitive indicating the purpose, Acts 16:10; followed by εἰς τί, Acts 13:2 (where ὁ is for εἰς ὁ, according to that familiar Greek usage by which a preposition prefixed to the antecedent is not repeated before the relative; cf. Winers Grammar, 421f (393); (Buttmann, 342 (294))).