From: blueletterbible.org

Don Stewart :: Does the Bible Claim to Be God’s Inerrant Word?

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The New Testament is also considered to be inspired of God for the following reasons:

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Accepted As Scripture

Although the concept of a completed New Testament may not be found, we do have the concept of the writings being considered as Scripture. Simon Peter compared the writings of Paul to other Scripture:

Our beloved brother Paul, according to the wisdom given to him, has written to you, as also in all his letters . . . which those who are untaught and unstable twist to their own destruction, as they do also the rest of Scripture (2 Peter 3:15,16).

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Specific Statements Of Other Writers

Apart from the four gospels, the New Testament makes other specific statements about its own inspiration. The Apostle Paul said that his writings were the commandments of the Lord.

If anyone thinks himself to be a prophet or spiritual, let him acknowledge that the things which I write to you are the commandments of the Lord (1 Corinthians 14:37).

In the first letter that Paul wrote, he stated that his commandments were to be received as the Word of God.

And for this reason we also constantly thank God that when you received from us the word of God’s message, you accepted it not as the word of men, but for what it really is, the word of God, which also performs its work in you who believe (1 Thessalonians 2:13).

Paul also emphasized that all Scripture is God-breathed.

All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness (2 Timothy 3:16).

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Related:

10 Misconceptions About the NT Canon: #3: “The NT Authors Did Not Think They Were Writing Scripture”

Does the Bible Claim to Be God’s Inerrant Word? — Jesus’ Statements

The Gospels are New Covenant and Apply To Us Today — Jesus sent the Holy Spirit to lead the disciples into all truth and to REMIND them of what He taught them to do. Then they did it and we can too — unstoppable!

Jesus’ statements in ‘Revelation’ support the apostles’ NT church life teaching and also present a balance to the trendy, lovey-dovey view of God. Jesus also added a strict warning to not be altered :: The Bible can be trusted!

The Early Church Fathers and Biblical Authority 100-400 A.D.:“All writers accepted the inspiration and authority of Holy Scripture as self-evident. … There was no temptation to restrict its range to favored passages of the Bible.”

Who-Goes-To-Heaven Scriptures — Narrow is the Way | Who are the Children of God? — “There is therefore now *no condemnation* to those who are IN CHRIST Jesus, who don’t WALK according to the flesh, but ACCORDING TO THE SPIRIT.”