Acts 13:34-39 (NLT)
34 For God had promised to raise him from the dead, not leaving him to rot in the grave. He said, ‘I will give you the sacred blessings I promised to David.’ 35 Another psalm explains it more fully: ‘You will not allow your Holy One to rot in the grave.’36 This is not a reference to David, for after David had done the will of God in his own generation, he died and was buried with his ancestors, and his body decayed. 37 No, it was a reference to someone else—someone whom God raised and whose body did not decay.
38 “Brothers, listen! We are here to proclaim that through this man Jesus there is forgiveness for your sins. 39 Everyone who believes in him is declared right with God—something the law of Moses could never do.

Paul and Barnabas were on the island of Antioch of Pisidia. It was the Sabbath and as the custom the books of Moses and the prophets were read from in the synagogue. The leaders asked Paul and Barnabas if they had any encouraging words for those who were gathered. Paul stood and began speaking to both Jews and God-fearing Gentiles. His words of encouragement were “We are here to proclaim that through this man Jesus there is forgiveness for your sins. Everyone who believes in him is declared right with God.”

Jesus used this illustration: "If you had one hundred sheep, and one of them strayed away and was lost in the wilderness, wouldn't you leave the ninety-nine others to go and search for the lost one until you found it? And then you would joyfully carry it home on your shoulders. When you arrived, you would call together your friends and neighbors to rejoice with you because your lost sheep was found. In the same way, heaven will be happier over one lost sinner who returns to God than over ninety-nine others who are righteous and haven't strayed away! The good news Paul shared is God wants to rescue those lost in sin. Even if there is one lost person, God is willing to save them and bring them back to Him. This is accomplished through Jesus Christ who was not left in the grave to rot, but was raised back to life. It was through Jesus forgiveness of sin was made available to all who believe in Him. Those who believe are declared right with God, justified and forgiven. Heaven rejoices over the sinner who believes in Christ for they have received forgiveness that could never be found through ones own religious efforts. Praise God Christ was willing to give of himself so that we could live eternally with Him.