Jesus died that day, and that would have been enough to save us alone, but Jesus not stop there, God wanted to break us free from the curse of death forever, and give us a way to spend eternity with Him. Jesus was buried in the tomb, then three days later He arose, He resurrected, proving that even death cannot separate one of His believers from God.
“And the angel answered and said unto the women, Fear not ye: for I know that ye seek Jesus, which was crucified. He is not here: for he is risen, as he said. Come, see the place where the Lord lay.” -Matthew 28:5,6.