The Catechism in Questions & Answers

181. What do the letters of the Apostles have to say about the sacrificial death of Jesus?

The significance of Jesus’ sacrificial death is described as follows in 2 Corinthians 5: 19: “God was in Christ reconciling the world to Himself.” In 1 John 3: 16 it says: “By this we know love, because He laid down His life for us.”
In his arguments with heretics who sought to deny the humanity of Jesus Christ and His resurrection, Apostle Paul made it clear “that Christ died for our sins according to the Scriptures, and that He was buried, and that He rose again the third day according to the Scriptures” (1 Corinthians 15: 3-4).