“Then Noah sent forth a dove.”
(Here is the first part of the scholion on this verse.)
Just as Noah sent forth the dove three times, so the Son of God is sent three times. The first time, He comes as the Son of Man, with ‘nowhere to rest his head’ just as the dove found no place to rest. His second coming is mystically, after the resurrection, and as the dove brought back an olive branch, so Jesus appears to His disciples saying, “Peace be with you.” And so we recall this coming in peace before we consume the holy Eucharist each day. When He comes the third time in glory, it will be the establishment of new heavens and a new earth, and He will no longer return to the Father, for God will be all in all.