What does the Bible say about the first proclamation of the Gospel?

In Luke 1, Zacharias delivers the first public proclamation of the Gospel after 400 years of silence from God's prophets. This sermon encapsulates the apostolic testimony about Jesus Christ, declaring His future role in redemption. As Zacharias praises God for visiting and redeeming His people, he lays foundational truths about the coming salvation through Christ. His declaration aligns with the promises made to the patriarchs, affirming God's faithfulness and the certainty of salvation that believers possess.