How do we know that salvation is for the Gentiles?

In Acts 11, Peter recounts his vision and the subsequent events that led to the Gentiles receiving the Gospel. Initially, the apostles focused on the Jews, as Jesus directed them in Matthew 10:5-6, but later, Jesus commanded them to preach the Gospel to all nations in Mark 16:15. The acceptance of the Gentiles showcases the fulfillment of God's promise that salvation through Jesus Christ is available to all people, not just the Jews. Peter concludes that God did not show favoritism in offering the gift of salvation, as stated in Acts 11:17, emphasizing that God granted repentance unto life, which includes Gentiles. This reflects a major shift in God's redemptive plan, celebrating His grace that encompasses all humanity.