The third day of Christmas.

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Two ways this one is seen.  By tradition in my church, it is seen as the feast of St. John the Evangelist.  It has been suggested that he holds such a close part to the Christ because of his chastity.  Known, among other things, as the virgin apostle.  A thing known pretty much only in my faith.

As well, the third day is considered about the three French hens, which connotates the three greatest virtues.  That of hope, faith, and charity.

Well, so my searches have indicated.  There are a lot of things that have been labeled this or that, about this and that.  But... this should do.