Ephesians 1:13-14

You also became believers in Christ. That happened when you heard the message of truth. It was the good news about how you could be saved. When you believed, he stamped you with an official mark. That official mark is the Holy Spirit that he promised. The Spirit marks us as God’s own. We can now be sure that someday we will receive all that God has promised. That will happen after God sets all his people completely free. All these things will bring praise to his glory.