14 distinct Greek words appear in this verse.

4 passages from patristic writers, Reformers, and church catechisms citing this verse.

• 1Pet 1:22 — Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
• 1Thess 5:27 — I charge you by the Lord that this epistle be read unto all the holy brethren.
• 1Tim 4:6 — If thou put the brethren in remembrance of these things, thou shalt be a good minister of Jesus Christ, nourished up in the words of faith and of good doctrine, whereunto thou hast attained.
• 1Tim 4:11 — These things command and teach.
• 1Tim 4:16 — 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.
• 1Tim 6:3 — If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness;
• 1Tim 6:3 — If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness;
• 1Tim 6:17 — Charge them that are rich in this world, that they be not highminded, nor trust in uncertain riches, but in the living God, who giveth us richly all things to enjoy;
• 2John 1:7 — For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
• 2John 1:9 — Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son.
• 2Tim 1:18 — The Lord grant unto him that he may find mercy of the Lord in that day: and in how many things he ministered unto me at Ephesus, thou knowest very well.
• Acts 18:19 — And he came to Ephesus, and left them there: but he himself entered into the synagogue, and reasoned with the Jews.
• Acts 20:1 — And after the uproar was ceased, Paul called unto him the disciples, and embraced them, and departed for to go into Macedonia.
• Acts 20:1 — And after the uproar was ceased, Paul called unto him the disciples, and embraced them, and departed for to go into Macedonia.
• Col 2:6 — As ye have therefore received Christ Jesus the Lord, so walk ye in him:
• Gal 1:6 — I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
• Gal 1:6 — I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel:
• Rev 1:11 — Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamos, an
• Rom 16:17 — Now I beseech you, brethren, mark them which cause divisions and offences contrary to the doctrine which ye have learned; and avoid them.
• Titus 1:5 — For this cause left I thee in Crete, that thou shouldest set in order the things that are wanting, and ordain elders in every city, as I had appointed thee:
• Titus 1:9 — Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.
• Titus 3:9 — But avoid foolish questions, and genealogies, and contentions, and strivings about the law; for they are unprofitable and vain.