"The words I have spoken to youβthey are full of the Spirit and life."
β John 6:63
Quick Answer
A red-letter Bible is an edition that prints the words attributed to Jesus in red ink so readers can locate them at a glance, a printing tradition begun in 1899 by editor Louis Klopsch rather than an ancient or divinely mandated feature. It is simply a reading aid; every word of Scripture, red or black, is equally God's inspired word (2 Timothy 3:16).
What Makes a Red-Letter Bible Different
A red-letter Bible is simply a printed edition where the words spoken by Jesus, mostly found in the four Gospels but sometimes also in Acts and Revelation, are set apart in red ink instead of the standard black used for the rest of the text. It is purely a formatting choice, meant to help readers quickly find and focus on what Jesus himself said.
Some editions extend the coloring to a wider range of material, occasionally including words spoken directly by God the Father or an angel quoted in the narrative, such as the voice from heaven at Jesus's baptism (Matthew 3:17), though this practice is far less common and less standardized than simply marking Jesus's own recorded speech. Most red-letter editions restrict themselves specifically to sayings the Gospel writers attribute directly to Jesus, keeping the convention simple and consistent for the average reader.
The History Behind the Format
The format traces back to 1899, when editor Louis Klopsch published the first red-letter New Testament, an idea that quickly spread and became a standard option offered across many popular translations, including the King James Version, the NIV, the ESV, and others. It is worth noting this is a publisher's editorial decision, applied on top of the translated text, not a feature preserved from any ancient manuscript.
Reportedly, Klopsch was moved by Jesus's words about the new covenant sealed in his blood (Luke 22:20) and wanted readers to be able to instantly see the words that came directly from the Savior's own mouth. Whatever its precise origin story, the format met an evident demand among readers and has remained a popular option in Bible publishing for well over a century since.
How Publishers Decide What Counts as Jesus's Words
Deciding exactly which words to mark red requires editorial judgment, and different publishers do not always agree perfectly. Most straightforward cases, like the Sermon on the Mount, are uncontroversial. But in passages like John 3, where Jesus's conversation with Nicodemus blends into the Gospel writer's own theological reflection, scholars genuinely debate where Jesus's spoken words end and John's narrative commentary begins. This is why you may occasionally notice small differences between red-letter editions from different publishers.
Some editions also include Jesus's words spoken from heaven after his resurrection and ascension, such as his words to Paul on the road to Damascus (Acts 9:4-6) or his messages to the seven churches in Revelation, while other editions restrict red print strictly to his earthly ministry in the Gospels. Neither convention is more correct than the other; both are simply different editorial choices about how far to extend the same basic formatting idea.
Benefits of the Format
For teaching, personal study, or simply getting to know Jesus's own words quickly, a red-letter Bible offers real practical value, letting a reader flip through the Gospels and see at a glance everything attributed directly to him. Many new believers find this format especially helpful as they first get acquainted with who Jesus is and what he taught.
This is especially valuable for someone newer to the faith who wants to move quickly past introductory questions about the Bible's structure and get directly to hearing Jesus teach in his own recorded words, on subjects like prayer, forgiveness, the kingdom of God, and how to treat other people. A red-letter New Testament can function almost like a highlighted introduction to Christ before a reader eventually works through the fuller text at a slower, more thorough pace.
One Study Aid Among Several
Red letters are far from the only reader-friendly feature added to Bibles over the centuries. Chapter divisions, added by Archbishop Stephen Langton in the thirteenth century, and verse numbers, added by printer Robert Estienne in the sixteenth century, are similarly later additions meant to aid navigation, not features of the original inspired text. Study notes, cross-reference columns, maps, and section headings serve the same practical purpose today.
Seen in that light, a red-letter Bible is simply one more helpful tool in a long tradition of formatting choices designed to make Scripture easier for ordinary readers to use well, not a mark of special status placed on some words over others.
Every Word Is God's Word
It is important to remember that this visual distinction carries no theological weight. 'All Scripture is God-breathed' (2 Timothy 3:16), a truth that applies equally to Moses's writings, the Psalms, Paul's letters, and every black-printed word in the Gospels' narration. Jesus himself said his words are 'full of the Spirit and life' (John 6:63), but the rest of Scripture, inspired by that same Spirit, carries no less authority or life-giving power.
This is also why treating the black-printed portions of the Gospels, the narrator's own explanations, Old Testament quotations woven into the story, and the words of other people speaking in the account, as somehow secondary would badly misunderstand how the Gospels work. Even the narration describing what Jesus did, and the theological commentary the Gospel writers add along the way, is just as inspired as his direct quotations, since 'prophets, though human, spoke from God as they were carried along by the Holy Spirit' (2 Peter 1:21). A red-letter edition simply highlights one voice within an entirely God-breathed text, not the only voice within it that matters.
Should You Use One
A red-letter Bible is a fine and useful tool, particularly for locating and studying Christ's direct teaching, but it should not become your only Bible or shape a habit of skipping over everything printed in black. Pair it with regular, full reading of the whole of Scripture so you receive a balanced, complete picture of everything God has revealed, since Scripture itself testifies about Christ from beginning to end (John 5:39).