John 10:28–30 is found in the Gospel of John, and from a typical evangelical Christian perspective the most-likely author is the Apostle John — the “beloved disciple” who was an eyewitness of Jesus’ ministry.

Quick context (the verses; ESV):
“I give them eternal life, and they will never perish, and no one will snatch them out of my hand. My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father’s hand. I and the Father are one.”

Why evangelicals usually attribute the Gospel to John the Apostle
– Early church testimony: Church fathers (Papias as quoted later by Eusebius, Irenaeus, Clement of Alexandria, and Tertullian) identify the author as John the son of Zebedee or the “disciple whom Jesus loved,” linking the Gospel to an eyewitness.
– Internal claims and eyewitness detail: The Gospel repeatedly points to an eyewitness source (“the disciple whom Jesus loved” appears several times; the writer claims to be an eyewitness in John 21:24). Evangelicals value the Gospel’s intimate, concrete details (e.g., the timing of events, specific conversations, and personal relationships) as signs of an eyewitness author.
– Consistency with the Johannine letters: The theology, vocabulary, and spiritual emphases of the Gospel align closely with 1–3 John, supporting common authorship. Many evangelicals also link the same John to the church in Ephesus and to the later New Testament witness.
– Historical plausibility: Tradition places John as an elder in Ephesus late in the first century (often dated c. 85–95 AD), a setting consistent with the Gospel’s theological reflection and pastoral purpose.

What evangelicals see John’s authorship to mean for interpreting John 10:28–30
– Eyewitness authority: Because John is seen as an eyewitness, his presentation of Jesus’ words carries historical and theological weight for doctrine.
– High Christology affirmed: John strongly affirms Jesus’ unity with the Father (“I and the Father are one”), a foundational text for understanding Jesus’ deity in evangelical theology.
– Assurance of salvation and perseverance: These verses are frequently appealed to in evangelical teaching about the security and permanence of salvation (“I give them eternal life… no one will snatch them out of my hand”). Evangelicals differ on some theological nuances (see below), but many read the text as offering real, present assurance grounded in Jesus’ person and work.

Caveats and diversity within evangelicalism
– Scholarly alternatives: Some critical scholars propose a Johannine community or later redactor rather than the Apostle himself. Evangelicals usually acknowledge these proposals but many prefer the traditional Johannine-apostolic authorship because of the historical and internal evidence noted above.
– Differences over “security”: While many evangelicals (particularly those in Reformed or “eternal security” traditions) read these verses as supporting unconditional eternal security (“once saved, always saved”), other evangelicals (often Arminian) affirm the strong assurance here while balancing it with passages about persevering faith and warnings against falling away.

Practical point
For evangelicals the Gospel of John — and passages like John 10:28–30 — is both historically rooted (eyewitness testimony) and theologically authoritative, used to ground confidence in Christ’s identity and the believer’s security in him, while calling for faithful trust and obedience.

If you’d like, I can list specific early patristic quotations that identify John, summarize evangelical commentaries on John 10:28–30, or outline how different evangelical traditions apply this passage.