Ἑβραΐς (WH Αβραΐς, see their Introductory § 408), ἑβραιδος, ἡ, Hebrew, the Hebrew language; not that however in which the O. T. was written, but the Chaldee (not Syro-Chaldaic, as it is commonly but incorrectly called; cf. A. Th. Hoffmann, Grammat. Syriac., p. 14), which at the time of Jesus and the apostles had long superseded it in Palestine: Acts 21:40; Acts 22:2; Acts 26:14; Ἑβραΐςφωνή, 4 Macc. 12:7; 16:15. (Cf. B. D., under the phrase, Shemitic Languages etc.; ibid. American edition, under the phrase, Language of the New Testament.)
Acts 21:40 - N-DFS GRK:προσεφώνησεν τῇ Ἐβραΐδι διαλέκτῳ λέγων NAS: he spoke to them in the Hebrew dialect, KJV: he spake unto [them] in the Hebrew tongue, INT: he spoke to [them] with the Hebrew language saying
Acts 22:2 - N-DFS GRK:ὅτι τῇ Ἐβραΐδι διαλέκτῳ προσεφώνει NAS: that he was addressing them in the Hebrew dialect, KJV: he spake in the Hebrew tongue INT: that in the Hebrew language he spoke to
Acts 26:14 - N-DFS GRK:με τῇ Ἐβραΐδι διαλέκτῳ Σαούλ NAS: saying to me in the Hebrew dialect, KJV: and saying in the Hebrew tongue, Saul, INT: me in the Hebrew language Saul
