From where do you know this?

#HC19

From the holy gospel, which God Himself first revealed in Paradise. Later, He had it proclaimed by the patriarchs and prophets, and foreshadowed by the sacrifices and other ceremonies of the law. Finally, He had it fulfilled through His only Son.

Proofs

From the holy gospel, which God Himself first revealed in Paradise. (Genesis 3:15)
Later, He had it proclaimed by the patriarchs (Genesis 12:3; Genesis 22:18; Genesis 49:10)
and prophets, (Isaiah 53; Jeremiah 23:5–6; Micah 7:18–20; Acts 10:43; Hebrews 1:1)
and foreshadowed by the sacrifices and other ceremonies of the law. (Leviticus 1:7; John 5:46; Hebrews 10:1–10)
Finally, He had it fulfilled through His only Son. (Romans 10:4; Galatians 4:4–5; Colossians 2:17)