Greek Bible Art: Baptism of Christ

The image shows the Baptism of Christ by Bacchiacca (source). This verse is from Luke 3:22.

καταβῆναι τὸ πνεῦμα τὸ ἅγιον σωματικῶ εἴδει ὡς περιστερὰν.
Descendit Spiritus Sanctus corporali specie sicut columba.
The Holy Ghost descended in a bodily shape like a dove.