Acts 2:47
KJV
Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.
NIV
praising God and enjoying the favor of all the people. And the Lord added to their number daily those who were being saved.
The KJV’s phrase “such as should be saved” presents salvation as a settled and completed reality: God adds to the church those who are saved, not those who are in the process of being saved. By contrast, modern versions’ “those who were being saved” introduces the idea of salvation as an ongoing or progressive experience. This obscures the biblical teaching that the new birth is a one-time event, fully accomplished the moment a person believes on Christ (John 1:12-13; John 5:24, Eph. 1:13). Salvation is not a gradual becoming; it is a definitive new birth. See also: 1 Cor. 1:18, 2 Cor. 2:15, 1 Pet. 2:2, Heb. 10:14
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