The Elaborate Medallion

I don't really use my office on campus. BUT SOMEBODY DOES. On those rare occasions requiring a visit, I unlock the door and always find some mysterious object left behind by my unknown office mate. Last time it was an individual-serving-sized foil pouch (unopened) of name-brand precooked salmon with dill. Today it was an elaborate medallion. The lettering says "I WILL SEND MY SPIRIT" and the image is that of a dove, I think, with a halo around its head. A dove would be obvious, given the Biblical bent of the elaborate medallion, but the "dove" is painted blue and may be a bluebird. (Below, something of minimum relevance.)