2 Corinthians 1:22

22 who also sealed us and gave us the Spirit in our hearts as a pledge.

2 Corinthians 5:5

5 Now He who prepared us for this very purpose is God, who gave to us the Spirit as a pledge.

Ephesians 1:14

14 who is given as a pledge of our inheritance, with a view to the redemption of God’s own possession, to the praise of His glory.