Among other legacies, Judaism bequeathed to Christianity the sacred number forty.
In the Old Testament we read that after Noah built the ark, the heavens opened, raining hard forty days and forty nights (Genesis 7:12). Moses remained on
Sinai for forty days and nights, receiving from God the Ten Commandments (Exodus 34:28). To reach the Mountain of God, Elijah walked forty days and nights (1
Kings 19:8). The same sacred number determined the date for women’s purification after the birth of a male child (Leviticus 12:1–5). Considered twice as
“unclean†as the mothers of males, mothers of females were “purified†eighty days after childbirth!