The mention of the Dove refers to a lost Gospel to which there are rare references in ancient writings.
1 The Dove fluttered over the Messiah, because He was her head; and she sang over Him and her voice was heard:
2 And the inhabitants were afraid and the sojourners were moved:
3 The birds dropped their wings and all creeping things died in their holes: and the abysses were opened which had been hidden; and they cried to the Lord like women in travail:
4 And no food was given to them, because it did not belong to them;
5 And they sealed up the abysses with the seal of the Lord. And they perished, in the thought, those that had existed from ancient times;
6 For they were corrupt from the beginning; and the end of their corruption was life:
7 And every one of them that was imperfect perished: for it was not possible to give them a word that they might remain:
8 And the Lord destroyed the imaginations of all them that had not the truth with them.
9 For they who in their hearts were lifted up were deficient in wisdom, and so they were rejected, because the truth was not with them. p. 133
10 For the Lord disclosed His way, and spread abroad His grace: and those who understood it, know His holiness. Hallelujah.