The Bible defines a believer as someone who fully relies on the truthfulness of Jesus Christ and His work for salvation.
In Acts 5:14, we see the term 'believers' used, indicating those who were added to the church through faith in Christ. To be a believer means not only to agree with the truth of the gospel but also to have a complete reliance upon Jesus Christ and His redemptive work. True belief is more than intellectual assent; it encompasses trust and dependence on Christ for salvation, as expressed in John 6:29, where the work of God is to believe on Him whom He has sent.
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