Eat unleavened bread on the first night of Passover

In the first month, on the fourteenth day of the month at evening, you shall eat unleavened bread, until the twenty-first day of the month at evening.

Hebrew

יח בָּרִאשֹׁן בְּאַרְבָּעָה עָשָׂר יוֹם לַחֹדֶשׁ, בָּעֶרֶב, תֹּאכְלוּ, מַצֹּת: עַד יוֹם הָאֶחָד וְעֶשְׂרִים, לַחֹדֶשׁ--בָּעָרֶב.

Greek

18 ἐναρχομένου τῇ τεσσαρεσκαιδεκάτῃ ἡμέρᾳ τοῦ μηνὸς τοῦ πρώτου ἀφ᾿ ἑσπέρας ἔδεσθε ἄζυμα ἕως ἡμέρας μιᾶς καὶ εἰκάδος τοῦ μηνὸς ἕως ἑσπέρας.

• Parashah: Bo
• Sefer HaChinuch: 10
• Mishneh Torah: Times — Leaven and Unleavened Bread

• Exodus 12:18

Enumeration and classification from BibleData. The Greek is the Septuagint reading of the same verse, carried by the source for comparison.