That there is a body of teaching that is to be faithfully passed on is clear from the repeated references in the New Testament to ‘the teaching,’ ‘sound doctrine,’ ‘tradition,’ and ‘passed on’.

Packer and Parrett (Grounded in the Gospel: Building Believers the Old-Fashioned Way) give some examples:

“And they devoted themselves to the apostles’ teaching.” (Acts 2:42)

“Watch out for those who cause divisions and put obstacles in your way that are contrary to the teaching you have learned.” (Rom. 16:17 NIV)

“Now I commend you because you remember me in everything and maintain the traditions even as I delivered them to you.” (1 Cor. 11:2)

“For I received from the Lord what I also passed on to you: The Lord Jesus, on the night he was betrayed, took bread, and when he had given thanks, he broke it and said, ‘This is my body, which is for you; do this in remembrance of me.’ ” (1 Cor. 11:23–24 NIV)

“For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures, that he was buried, that he was raised on the third day according to the Scriptures.” (1 Cor. 15:3–4 NIV)

“So then, brothers, stand firm and hold to the traditions that you were taught by us, either by our spoken word or by our letter.” (2 Thess. 2:15 NIV)

“Keep away from every brother who is idle and does not live according to the teaching you received from us.” (2 Thess. 3:6 NIV)

“So that you may charge certain persons not to teach any different doctrine.” (1 Tim. 1:3)

“Let all who are under a yoke as slaves regard their own masters as worthy of all honor, so that the name of God and the teaching may not be reviled.” (1 Tim. 6:1)

“If anyone teaches a different doctrine and does not agree with the sound words of our Lord Jesus Christ and the teaching that accords with godliness, he is puffed up with conceit and understands nothing.” (1 Tim. 6:3–4)

“For the time will come when they will not endure sound doctrine.” (2 Tim. 4:3 NASB)

“He must hold firm to the trustworthy word as taught, so that he may be able to give instruction in sound doctrine and also to rebuke those who contradict it.” (Titus 1:9)

“But as for you, teach what accords with sound doctrine.” (Titus 2:1)

“Show that they can be fully trusted, so that in every way they will make the teaching about God our Savior attractive.” (Titus 2:10 NIV)

“It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them.” (2 Peter 2:21 NIV)

“Anyone who runs ahead and does not continue in the teaching of Christ does not have God; whoever continues in the teaching has both the Father and the Son.” (2 John 9 NIV)