One of the questions I get asked all the time is when to celebrate the Pessach? This issue arises because of the wording of Exo 12:6
וְהָיָה לָכֶם לְמִשְׁמֶרֶת עַד אַרְבָּעָה עָשָׂר יוֹם לַחֹדֶשׁ הַזֶּה וְשָׁחֲטוּ אֹתוֹ כֹּל קְהַל עֲדַת יִשְׂרָאֵל בֵּין הָעַרְבָּיִם
“You are to keep it until the fourteenth day of the month, and then the entire assembly of the community of Isra’el will slaughter it at dusk” (CJB)