1 John 5:11
And this is that testimony: God has given us eternal life, and this life is in His Son.
What it says
God's testimony is that He has given eternal life, and that life is in His Son.
What it is doing
This verse states the heart of the gospel assurance John is pressing.
In context
9Even if we accept human testimony, the testimony of God is greater. For this is the testimony that God has given about His Son. 10Whoever believes in the Son of God has this testimony within him; whoever does not believe God has made Him out to be a liar, because he has not believed in the testimony that God has given about His Son. 11And this is that testimony: God has given us eternal life, and this life is in His Son. 12Whoever has the Son has life; whoever does not have the Son of God does not have life.