Why the Third Day in 1 Corinthians 15:3–4
Paul does not give the third day as a calendar curiosity but as part of the scripturally shaped message he received and passed on. The raising on the third day belongs to the good news itself, announced beforehand in the Scriptures.
John 3:16: What Christians Believe About God's Love
Christians believe the gospel begins with God's love, not with our effort. John 3:16 makes God's gift of his Son the center and trust in that Son the dividing line between perishing and eternal life.