The Catechism in Questions & Answers

175. What events accompanied the crucifixion of the Lord?

When Jesus died on the cross, the earth shook and rocks were split. The veil of the temple, which separated the holiest space (“the Most Holy Place”) from the rest of the temple, was torn in two. This signified that the Old Testament’s sacrificial service was no longer necessary, owing to the death of Christ. His sacrifice opened the way to God.
When the Roman captain and the soldiers guarding Jesus on the cross felt the earth shake, they cried out: “Truly this was the Son of God!” (Matthew 27: 54). Thereby even the Gentiles professed that Jesus is the Son of God.

Old covenant/new covenant: On Mount Sinai, God made a covenant with the people of Israel, the descendants of Abraham, Isaac, and Jacob. The mark of the old covenant was circumcision. The old covenant also includes the Mosaic Law, in which the will of God comes to expression. The new covenant was established with Jesus’ sacrificial death. This new covenant no longer applies to the Jews alone, but to all human beings. Anyone can share in the new covenant through baptism with water.