And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters. Genesis 1:2
"The rabbinic interpretation of Genesis 1:2 was that the Spirit of God moved (or brooded) upon the face of the waters “like a dove.” With the Jewish mindset already associating the Holy Spirit with a dove, it was quite natural for God to use that motif in the revelation of the Holy Spirit.
The spiritual Jewish thought of that day would immediately draw a connection between the Spirit descending like a dove upon the Son (as the Gospels describe Jesus' baptism) and the anointing of the Holy Spirit, as depicted in Isaiah 61:1-3."