In the first month, on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.
In the first month. It is worthy of notice, that in prescribing the formalities which in future times were to mark all feasts and offering, Moses indicates the reason for the observance, by naming the months by their numeral order (cf. Leviticus 23:5-6; Numbers 9:1; Numbers 28:16-17). Even respecting the first command to keep the Passover, this style is adopted (Corbaux on the 'Historical Origin of the Passover').