We are sealed by the Holy Spirit  -  Ephesians 1:13

In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,

Paul traced the steps by which the Ephesians were brought into union with Christ. First, they heard the good news of salvation, through faith in Jesus Christ. Having heard the message, they made a commitment of themselves to Christ by a decisive act of faith. As soon as they believed, they were sealed with the Holy Spirt of promise. This means that every believer receives the Spirit of God as a sign that they belong to God and that they will be kept safe by God until the time they receive their glorified body. The indwelling Spirit brands us as God’s property and guarantees our preservation until the day of redemption.