1 John 4:14

Verse 14. And we have seen and do testify.

This is certainly personal. By the "we" John means himself and fellow apostles. They saw the Son when he was here on earth saw his miracles; heard his teaching; saw him die. Saw him, and heard him, and handled him after his resurrection. Received from him power from on high, enabling them to testify with infallible accuracy, and "we do testify to all these things"; and they were further authorized to say, that there is "none other name under heaven given among men whereby we must be saved."