1. absolutely,

a. to hold discourse with others in order to instruct them, deliver didactic discourses: Matthew 4:23; Matthew 21:23; Mark 1:21; Mark 6:6; Mark 14:49; Luke 4:15; Luke 5:17; Luke 6:6; John 6:59; John 7:14; John 18:20, and often in the Gospels; 1 Timothy 2:12.

b. to be a teacher (see διδάσκαλος, 6): Romans 12:7.

c. to discharge the office of teacher, conduct oneself as a teacher: 1 Corinthians 4:17.

2. in construction;

a. either in imitation of the Hebrew לְ לִמַּד (Job 21:22) or by an irregular use of the later Greeks (of which no well-attested example remains except one in Plutarch, Marcell c. 12), with the dative of person: τῷ Βαλάκ, Revelation 2:14 (according to the reading now generally accepted for the Rec.bez elz τόν Βαλάκ); cf. Buttmann, 149 (130); Winers Grammar, 223 (209), cf. 227 (213).

b. according to the regular use, with the accusative of person, to teach one: used of Jesus and the apostles uttering in public what they wished their hearers to know and remember, Matthew 5:2; Mark 1:22; Mark 2:13; Mark 4:2; Luke 5:3; John 8:2; Acts 4:2; Acts 5:25; Acts 20:20; τούς Ἕλληνας, to act the part of a teacher among the Greeks, John 7:35; used of those who enjoin upon others to observe some ordinance, to embrace some opinion, or to obey some precept: Matthew 5:19; Acts 15:1; Hebrews 8:11; with especially reference to the addition which the teacher makes to the knowledge of the one he teaches, to impart instruction, instill doctrine into one: Acts 11:26; Acts 21:28; John 9:34; Romans 2:21; Colossians 3:16; 1 John 2:27; Revelation 2:20.

c. the thing taught or enjoined is indicated by a following ὅτι: Mark 8:31; 1 Corinthians 11:14; by a following infinitive, Luke 11:1; Matthew 28:20; Revelation 2:14; περί τίνος, 1 John 2:27; ἐν Χριστῷ διδαχθῆναι, to be taught in the fellowship of Christ, Ephesians 4:21; followed by an accusative of the thing, to teach i. e. prescribe a thing: διδασκαλίας, ἐντάλματα ἀνθρώπων, precepts which are commandments of men (from Isaiah 29:13), Matthew 15:9; Mark 7:7 (Buttmann, 148 (129)); τήν ὁδόν τοῦ Θεοῦ, Matthew 22:16; Mark 12:14; Luke 20:21; ταῦτα, 1 Timothy 4:11; ἅ μή δεῖ, Titus 1:11; to explain, expound, a thing: Acts 18:11, 25; Acts 28:31; ἀποστασίαν ἀπό Μωϋσέως, the necessity of forsaking Moses, Acts 21:21.

d. with the accusative of person and of thing, to teach one something (Winers Grammar, 226f (212); Buttmann, 149 (130)): (ἐκεῖνος ὑμᾶς διδάξει πάντα, John 14:26); τοῦ διδάσκειν ὑμᾶς τινα τά στοιχεῖα, Hebrews 5:12 (where R G T Tr and others read — not so well — τινα; (but cf. Buttmann, 260 (224) note, 268 (230) note)); ἑτέρους διδάξαι, namely, αὐτά, 2 Timothy 2:2; hence, passive διδαχθῆναι τί (Buttmann, 188 (163); Winer's Grammar, 229 (215)): Galatians 1:12 (ἐδιδάχθην, namely, αὐτό), 2 Thessalonians 2:15.