John 1:18

No one has ever seen God, but God the One and Only, who is at the Father's side, has made him known.

No one has ever seen God
Exodus 33:20 "But," he said, "you cannot see my face, for no one may see me and live."
John 6:46 "No one has seen the Father except the one who is from God; only he has seen the Father."
Colossians 1:15 He is the image of the invisible God, the firstborn over all creation.
1 Timothy 6:16 ... who alone is immortal and who lives in unapproachable light, whom no one has seen or can see. To him be honor and might forever. Amen.
1 John 4:12 No one has ever seen God; but if we love one another, God lives in us and his love is made complete in us.

but God the One and Only
John 3:16 "For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life."
John 3:18 "Whoever believes in him is not condemned, but whoever does not believe stands condemned already because he has not believed in the name of God's one and only Son."
1 John 4:9 This is how God showed his love among us: He sent his one and only Son into the world that we might live through him.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.