And you shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.
All Commentaries on Exodus 12:6 Go To Exodus 12
Jerome
AD 420
We read in Exodus that on the fourteenth day a lamb is sacrificed; on the fourteenth day when the moon is a full moon, when its light is at its brightest. You see Christ is not immolated except in perfect and full light.