KJV:
Who hath also sealed us, and given the earnest of the Spirit in our hearts.
NASB:
who also sealed us and gave us the Spirit in our hearts as a pledge.
KJV:
Now he that hath wrought us for the selfsame thing is God, who also hath given unto us the earnest of the Spirit.
NASB:
Now He who prepared us for this very purpose is God, who gave to us the Spirit as a pledge.
KJV:
Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.
NASB:
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.