2 Corinthians 1 22
it is He who has also put His seal on us [that is, He has appropriated us and certified us as His] and has given us the [Holy] Spirit in our hearts as a pledge [like a security deposit to guarantee the fulfillment of His promise of eternal life].
Compare with other 3 random translations
WEB 2 Corinthians 1:22who also sealed us and gave us the down payment of the Spirit in our hearts.
GNV 2 Corinthians 1:22Who hath also sealed vs, and hath giuen the earnest of the Spirit in our hearts.
NCV 2 Corinthians 1:22He put his mark on us to show that we are his, and he put his Spirit in our hearts to be a guarantee for all he has promised.