The Holy Scriptures

The Bible — both the Old and New Testaments — is the inspired Word of God, the only infallible and authoritative rule of faith and practice. It is without error in everything it teaches and is sufficient for all matters of belief and conduct.

Every Scripture is God-breathed and profitable for teaching, for reproof, for correction, and for instruction in righteousness, that each person who belongs to God may be complete, thoroughly equipped for every good work.
— 2 Timothy 3:16-17 (WEB)

Note

Evangelicals are people of the Book. Scripture is the supreme authority — over tradition, experience, and human reason.

Bible references

2 Timothy 3:16-17 · 2 Peter 1:20-21 · Psalm 119:105 · Isaiah 40:8 · Hebrews 4:12 · Matthew 5:17-18