That God gave (οτ εδωκεν ο θεος). Declarative οτ in apposition with μαρτυρια as in verse 1. John 5:14; John 3:19. Note aorist active indicative εδωκεν (from διδωμ) as in 1. John 3:23, the great historic fact of the Incarnation (John 3:16), but the perfect δεδωκεν in 1. John 3:1 to emphasize the abiding presence of God's love.

Eternal life (ζωην αιωνιον). Anarthrous emphasizing quality, but with the article in 1. John 1:2.