Who Knows One? I know one!
One is our God in the heaven and earth.
Two are the tablets of the covenant.
Three are the patriarchs.
Four are the matriarchs.
Five are the books of the Torah.
Six are the sections of the Mishnah.
Seven are the days of the week.
Eight are the days to circumcision.
Nine are the months to childbirth.
Ten are the commandments at Sinai.
Eleven are the stars in Joseph’s dream.
Twelve are the tribes of Israel.
Thirteen are the attributes of God.

haggadah Section: Hallel
Source: http://www.jewbelong.com/passover/