But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
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1 John 1:5-9
Tyndale Open Study Notes (CC BY-SA 4.0).
1:7 Believers have fellowship with each other and with God as they live in the light. People cannot say they commune with God and then refuse to have fellowship with God’s people. This was the case with the Gnostics. The apostles of Christ had known Jesus Christ as God-in-the-flesh and were continuing to have spiritual fellowship with him (1:3).
Other Bible passages linked to this one, most cited first.
For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light:
The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armour of light.
And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,
In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace;
And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
He that saith he is in the light, and hateth his brother, is in darkness even until now. He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.