The Hebrew people had two calendars, a civil calendar and a sacred calendar related to God’s salvation. This corresponds with the fact that God’s people have two births, two beginnings: a physical birth with a physical beginning and a spiritual birth with a spiritual beginning (cf. John 3:3-6). The Passover, a new beginning for the children of Israel, was held in the first month of the sacred year, the month of Abib (Exo. 13:4 and note Exo. 13:41a).