Today is the Second Day of Christmas. In this verse, the "two turtle doves" refers to the Old and New Testaments.
On the second day of Christmas,
my true love sent to me
Two turtle doves,
And a partridge in a pear tree.
This post is one of a series explaining the Twelve Days of Christmas. Over the next 11 days of the Christmas season (ending on January 6th "The Epiphany") I'll post more information about the following verses of this song. I hope you'll find the "coded" meanings as interesting as I have! For more information, you can also check out appleseeds.org and CIN. Picture from AtHomeWithGod.com