Some quotes from the Book of Acts about the significance of Easter.
Acts 2:32, 36
God has raised this Jesus to life; and we are all witnesses of it … Therefore let all Israel be assured of this: God has made this Jesus, whom you crucified, both Lord and Messiah.
then know this, you and all the people of Israel: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed. Jesus is ‘the stone your builders rejected, which has become the cornerstone.’ Salvation is found in on one else, for there is no other name under heaven given to mankind by which we must be saved.
He commanded us to preach to the people and to testify that he is the one whom God appointed as judge of the living and the dead. All the prophets testify about him that everyone who believes in him receives forgiveness of sins through his name.
Acts 13: 32-33, 38-39
We tell you the good news: What God promised our ancestors he has fulfilled for us, their children, by raising up Jesus … Therefore, my friends, I want you to know that through Jesus the forgiveness of sins is proclaimed to you. Through him everyone who believes is set free from every sin, a justification you were not able to obtain under the law of Moses.
In the past God overlooked such ignorance, but now he commands all people everywhere to repent. For he has set a day when he will judge the world with justice by the man he has appointed. He has given proof of this to everyone by raising him from the dead.