1 John 1:5
This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
Cross-references
In 1 John 1:7, walking in the light as He is in light brings fellowship and cleansing — directly building on the declaration that God is light.
In 1 John 3:11, the 'message' is love — complementing the message of God being light, as walking in light means loving.
Psalm 36:9 speaks of God as the fountain of life and in His light we see light — echoing the theme of God as light.
Revelation 22:5 says there will be no night, for the Lord God gives them light — the eternal state where God's light excludes all darkness.
Revelation 21:23 shows the new Jerusalem lit by God's glory and the Lamb — a future fulfillment of God being the light.
James 1:17 calls God the Father of lights, with no variation or shadow — echoing the statement that in him there is no darkness.
1 Timothy 6:16 describes God dwelling in unapproachable light, unseen by humans — complementing the declaration that God is light with no darkness.
John 9:5 again states Jesus is the light of the world during his earthly ministry — reinforcing that God's light shines in Christ.
In John 8:12, Jesus calls himself the light of the world, promising no darkness for his followers — a direct personal claim that God is light.
John 1:9 identifies the true light that gives light to everyone as the Word made flesh — this is the embodiment of the message that God is light.
Isaiah 60:19 foretells the Lord as everlasting light — an OT prophecy that aligns with the declaration that God is light.
Psalm 84:11 calls the Lord a sun and shield — another OT image of God as light, complementing 'God is light'.
Psalm 27:1 declares the Lord as light — an OT parallel to the statement that God is light, reinforcing the metaphor.
2 Corinthians 6:14 asks 'what communion has light with darkness?' — directly parallels the idea that God's light has no darkness.
Daniel 2:22 states directly that 'light dwells with Him' — almost identical to 'God is light', emphasizing God's revelation.
Isaiah 9:2 foretells light shining on those in darkness — the same contrast, here applied to the coming Messiah's work.
John 12:35 warns to walk while you have the light, lest darkness overtake — a practical call based on the nature of God as light.
John 12:36 urges belief in the light to become children of light — this flows from the truth that God is light.
Romans 13:12 contrasts night/day, works of darkness — same moral dualism, urging believers to live as children of light.
Luke 1:79 speaks of giving light to those in darkness — parallel to the light/darkness dichotomy, here about Christ's coming.