Exod. 12:2and in the following verses: On the tenth day of this month every man shall take a lamb according to his family and his household, and you shall keep it until the fourteenth day of this month
Exod. 13:3 and 6(that is of the First Month) and the whole assembly of the sons of Israel shall sacrifice their lambs in the evening.
Exod. 12:6And I found that the Apostle spoke thus concerning the sacrifice of Christ, not concerning the Resurrection, saying: For Christ, our Paschal lamb, has been sacrificed.
1 Cor. 5:7 (V)Again in Exodus: You shall observe this day throughout your generations as an ordinance forever, in the First Month, on the fourteenth day of the month.
Exod. 12:17Also in Leviticus: If anyone is clean and is not on a journey, yet refrains from keeping the passover, that person shall be cut off from his people, because he did not offer the Lord's offering at its appointed time
Num. 9:13 (V)(that is in the First Month). I feared this and I sought diligently what the Hebrews, the Greeks, the Latins, and the Egyptians observed and thought about this time, which I shall demonstrate below.