1 John 1:5

“This then is the message, &c.] Of God by his Son the Word, or from Christ by his apostles. The Syriac version renders it, “this is the Gospel”; which is good news from a far country, a message sent from the King of kings to sinful men: or this is the annunciation, or declaration; that is, the thing declared, or showed. Some render it, “this is the promise”, that whereas God is light, such who walk in the light shall have communion with him, and others shall not: which we have heard of him; of Christ, who has declared him, that he is light without any mixture of darkness; that is a pure Spirit, and must be worshipped in a spiritual way; and that only spiritual worshippers are such as he…”

“First division of the body of the Epistle (compare Introduction). declare--Greek, "announce"; report in turn; a different Greek word from Jo1 1:3. As the Son announced the message heard from the Father as His apostle, so the Son's apostles announce what they have heard from the Son. John nowhere uses the term "Gospel"; but the witness or testimony, the word, the truth, and here the message. God is light--What light is in the natural world, that God, the source of even material light, is in the spiritual, the fountain of wisdom, purity, beauty, joy, and glory. As all material life and growth depends on light, so all spiritual life and growth depends on GOD. As God here, so Christ, in Jo1 2:8,…”

“This then is the message which we have heard of him - This is the substance of the announcement (ἐπαγγελία epangelia) which we have received of him, or which he made to us. The message here refers to what he communicated as the sum of the revelation which he made to man. The phrase “of him” (απ ̓ αὐτου ap' autou) does not mean respecting him, or about him, but from him; that is, this is what we received from his preaching; from all that he said. The peculiarity, the substance of all that he said, may be summed up in the declaration that God is light, and in the consequences which follow from this doctrine. He came as the messenger of Him who is light; he came to inculcate and defend the…”

“And this is the sum of the message which we have heard of him - The Son of God. That God is light - The light of wisdom, love, holiness, glory. What light is to the natural eye, that God is to the spiritual eye. And in him is no darkness at all - No contrary principle. He is pure, unmixed light. 1 John 1:6”

“1:5–2:6 Here John focuses on the first aspect of living in fellowship with God. Living in the light means that the believers will see that they are sinners, but they will also realize that Jesus is their Advocate to make them right with God (see Eph 5:6-13). 1:5 God is light: This light shone through Jesus Christ to all he came in contact with, to expose their sin and to illumine the moral nature and character of God (see John 1:4-5, 9; 3:19-21; 8:12; 9:5; 12:35-36, 46). In the writings of John, “light” represents God’s holiness and revelation. It is the opposite of false teaching and undisciplined living, which is “darkness” (1 Jn 1:6).”

“the message: Jo1 3:11; Co1 11:23 that God: Psa 27:1, Psa 36:9, Psa 84:11; Isa 60:19; Joh 1:4, Joh 1:9, Joh 8:12, Joh 9:5, Joh 12:35, Joh 12:36; Ti1 6:16; Jam 1:17; Rev 21:23, Rev 22:5 1 John 1:6”