Commentaries:
Robertson's Word Pictures (NT)
The Spirit and the water and the blood (to pneuma kai to udwr kai to aima). The same three witnesses of verses I John 5:6-7 repeated with the Spirit first.
The three (oi treiv). The resumptive article.
Agree in one (eiv to en eisin). "Are for the one thing," to bring us to faith in Jesus as the Incarnate Son of God, the very purpose for which John wrote his Gospel ( 20:31).
Other Robertson's Word Pictures (NT) entries containing 1 John 5:8:
1 John 5:7
1 John 5:9
1 John 5:13
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