Understanding The Days

Πλυνάτωσαν τὰ ἰμάτια σήμερον καὶ αὔριον, καὶ ἐστωσαν ἔτοιμοι εἰς τὴν ἡμέραν τὴν τρίτην, λέγει ἡ Γραφὴ, τοῦτο δηλοῦσα· Οἱ ἐν ταῖς δύο Διαθήκαις καὶ ταῖς αὐτῶν διανοίαις τὴν καθαρότητα τῆς πολιτείας κτησάμενοι, καὶ τῆς πίστεως τὴν ἁγνείαν εὐράμενοι, εἰς τὴν τριήμερον τοῦ Κυρίου χειραγωγοῦνται ἀνάστασιν· ἣ καὶ βασιλεία οὐρανῶν ὀνομάζεται. Σήμερον γὰρ, τὴν τοῦ νόμου λέγει κατάστασιν· αὔριον δὲ, τὴν εὐαγγελικὴν σημαίνει ἀλήθειαν, ὡς ὑπὸ τοῦ νόμου μηνυθεῖσαν, καὶ μετ' ἐκεῖνον φανεῖσαν. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλίον Πρῶτον, Ἐπιστολή ΤΝΕ' Λυσιμαχῳ Source: Migne PG 78.385a

'Let them wash their vestments today and tomorrow, and they shall be prepared for the third day,' 1 says Scripture. The meaning of the words is this: They who have adopted a pure life in accordance with the the Two Testaments and the understanding of them, having acquired a holy faith, are led by the hand to the third day of the resurrection of the Lord, which indeed is named the kingdom of heaven. For by today the Law is understood, and tomorrow signifies the Gospel truth, that which the Law has foreshadowed and which appeared after it. Saint Isidore of Pelusium, Book 1, Letter 355, To Lysimachos 1 Exodus 19.10-11