1:22a placed His seal on us,

It is God who sealed us (incl.) ⌊as belonging to him⌋,
-or-
He also placed his mark of ownership upon us.

1:22b and put His Spirit in our hearts as a pledge of what is to come.

and he has given/sent his Spirit to live in our hearts as a pledge.
-or-
And he himself put the Holy Spirit to live/walk/interact with us as a sign/means of knowing that we will receive all his promises in the future.

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