John 1:4

In him was life, and that life was the light of men.

In him was life
John 5:26 "For as the Father has life in himself, so he has granted the Son to have life in himself."
John 6:57 "Just as the living Father sent me and I live because of the Father, so the one who feeds on me will live because of me."
John 10:28 "I give them eternal life, and they shall never perish; no one can snatch them out of my hand."
John 11:25-26 Jesus said to her, "I am the resurrection and the life. He who believes in me will live, even though he dies; and whoever lives and believes in me will never die. Do you believe this?"
John 14:6 Jesus answered, "I am the way, the truth and the life. No one comes to the Father except through me."
1 John 1:1-2 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked at and our hands have touched--this we proclaim concerning the Word of life. The life appeared; we have seen it and testify to it, and we proclaim to you the eternal life, which was with the Father and has appeared to us.
1 John 5:20 We know also that the Son of God has come and has given us understanding, so that we may know him who is true. And we are in him who is true--even in his Son Jesus Christ. He is the true God and eternal life.
Revelation 1:18 "I am the Living One; I was dead, and behold I am alive for ever and ever! And I hold the keys of death and Hades."

and that life was the light of men
Psalm 36:9 For with you is the fountain of life; in your light we see light.
John 8:12 When Jesus spoke again to the people, he said, "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
John 9:5 "While I am in the world, I am the light of the world."
John 12:46 " I have come into the world as a light, so that no one who believes in me should stay in darkness."

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.