For just as they [the Hebrews] were prefigured in a male lamb (cf. Exod. 12.5), so are we in the man like a lamb (cf. Isa. 53.7); just as they were prefigured in a perfect lamb (cf. Exod. 12.5), so are we in the fullness (cf. John 1.16) of him who has carried out his Father's will; just as they were prefigured in a one-year-old lamb, so are we at the end of the ages (1 Cor. 10.11)-for just as the year is the fulfillment of the months, so is he the fulfillment of the law and the prophets-just as they in a lamb without blemish (cf. Exod. 12.5 etc.), so we in a man without sin; just as they in the first month (cf. Lev. 23.5), so we in the beginning of all creation, in which all things were made (cf. Rev. 3.14; Col. 1.15-16) in the tenth day (cf. Exod. 12.3), in the fullness of the μοναρχία (= sovereignty, absolute rule). As for the words up to the fourteenth (cf. Exod. 12.6), a number of the second week, this signifies a repose of two weeks which came between the first creation, ie, the invisible one, and the second creation, the visible one. [Origen Peri Pascha 42.1 - 23]
The surviving MS reads 'tenth month' but it is obviously a scribal error for 'tenth day' given the context.