Who Knows Thirteen?

Who knows thirteen?I know thirteen.Thirteen are God's attributes;
Twelve, the tribes of Israel;
Eleven, the stars in Joseph's dream;
Ten are the commandments;
Nine are the months of childbirth;
Eight are the days before circumcision;
Seven are the days of the week;
Six are the sections of the Mishnah;
Five are the books of the Torah;
Four are the matriarchs;
Three are the patriarchs;
Two are the tablets of the covenant;
One is our God, in heaven and on earth.