Teachers explain the Scriptures with clarity and detail. Their mission is to strengthen the Church in the Word of God.
General references
Or ministry, let us wait on our ministering: or he that teacheth, on teaching; (Rom 12:7 KJV)
11 And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;
12 For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: (Eph 4:11-12 KJV)
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord. (Col 3:16 KJV)
A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach; (1Ti 3:2 KJV)
Let the elders that rule well be counted worthy of double honour, especially they who labour in the word and doctrine. (1Ti 5:17 KJV)
And the things that thou hast heard of me among many witnesses, the same commit thou to faithful men, who shall be able to teach others also. (2Ti 2:2 KJV)
24 And the servant of the Lord must not strive; but be gentle unto all men, apt to teach, patient,
25 In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth; (2Ti 2:24-25 KJV)
Specific examples
Paul
Paul also and Barnabas continued in Antioch, teaching and preaching the word of the Lord, with many others also. (Act 15:35 KJV)
And how I kept back nothing that was profitable unto you, but have shewed you, and have taught you publickly, and from house to house, (Act 20:20 KJV)
Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ, with all confidence, no man forbidding him. (Act 28:31 KJV)
19 Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.
20 Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.
21 Be not overcome of evil, but overcome evil with good. (Rom 12:19-21 KJV)
8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
10 Love worketh no ill to his neighbour: therefore love is the fulfilling of the law. (Rom 13:8-10 KJV)
For this cause have I sent unto you Timotheus, who is my beloved son, and faithful in the Lord, who shall bring you into remembrance of my ways which be in Christ, as I teach every where in every church. (1Co 4:17 KJV)
Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned: (1Ti 1:5 KJV)
Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee. (1Ti 4:16 KJV)
Whereunto I am appointed a preacher, and an apostle, and a teacher of the Gentiles. (2Ti 1:11 KJV)
Barnabas
Paul also and Barnabas continued in Antioch, teaching and preaching the word of the Lord, with many others also. (Act 15:35 KJV)
Apollos
25 This man was instructed in the way of the Lord; and being fervent in the spirit, he spake and taught diligently the things of the Lord, knowing only the baptism of John.
26 And he began to speak boldly in the synagogue: whom when Aquila and Priscilla had heard, they took him unto them, and expounded unto him the way of God more perfectly.
27 And when he was disposed to pass into Achaia, the brethren wrote, exhorting the disciples to receive him: who, when he was come, helped them much which had believed through grace:
28 For he mightily convinced the Jews, and that publickly, shewing by the scriptures that Jesus was Christ. (Act 18:25-28 KJV)
Timothy
For this cause have I sent unto you Timotheus, who is my beloved son, and faithful in the Lord, who shall bring you into remembrance of my ways which be in Christ, as I teach every where in every church. (1Co 4:17 KJV)
3 As I besought thee to abide still at Ephesus, when I went into Macedonia, that thou mightest charge some that they teach no other doctrine,
4 Neither give heed to fables and endless genealogies, which minister questions, rather than godly edifying which is in faith: so do.
5 Now the end of the commandment is charity out of a pure heart, and of a good conscience, and of faith unfeigned: (1Ti 1:3-5 KJV)
11 These things command and teach.
12 Let no man despise thy youth; but be thou an example of the believers, in word, in conversation, in charity, in spirit, in faith, in purity.
13 Till I come, give attendance to reading, to exhortation, to doctrine. (1Ti 4:11-13 KJV)
And they that have believing masters, let them not despise them, because they are brethren; but rather do them service, because they are faithful and beloved, partakers of the benefit. These things teach and exhort. (1Ti 6:2 KJV)
Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine. (2Ti 4:2 KJV)
Titus
But speak thou the things which become sound doctrine:
2 That the aged men be sober, grave, temperate, sound in faith, in charity, in patience.
3 The aged women likewise, that they be in behaviour as becometh holiness, not false accusers, not given to much wine, teachers of good things; (Tit 2:1-3 KJV)
9 Exhort servants to be obedient unto their own masters, and to please them well in all things; not answering again;
10 Not purloining, but shewing all good fidelity; that they may adorn the doctrine of God our Saviour in all things. (Tit 2:9-10 KJV)