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On the tenth day of Christmas, my True Love gave to me, ten lords
a-leaping.
These ten lords represent the Ten Commandments, also known as
the Decalogue, and are handed on to us in the books of Exodus and
Deuteronomy.
In the book of Exodus, the Commandments are found at Ex 20:1-17.
I the LORD am your God who brought you out of the land of Egypt.
You shall have no other gods besides me.
You shall not take the name of the LORD, your God, in vain.
Remember to keep holy the sabbath day.
Honor your father and your mother.
You shall not kill.
You shall not commit adultery.
You shall not steal.
You shall not bear false witness against your neighbor.
You shall not covet your neighbors house, nor anything else that
belongs to him. (abridged, from Ex 20:1-17)

On the eleventh day of Christmas my True Love gave to me, eleven
pipers piping.
The eleven pipers represent the eleven original Apostles who
remained faithful to Jesus.
These Apostles are Andrew, Bartholomew, James the Greater,
James the Lesser, John, Jude, Matthew, Thomas, Philip, Simon and
Peter. Although Peter denied Jesus before the Crucifixion, he is
included in this list because he repented of his mistake.