אֲבָ֞ל הָעָ֥ם רָב֙ וְהָעֵ֣ת גְּשָׁמִ֔ים וְאֵ֥ין כֹּ֖חַ לַעֲמ֣וֹד בַּח֑וּץ וְהַמְּלָאכָ֗ה לֹֽא־לְי֤וֹם אֶחָד֙ וְלֹ֣א לִשְׁנַ֔יִם כִּֽי־הִרְבִּ֥ינוּ לִפְשֹׁ֖עַ בַּדָּבָ֥ר הַזֶּֽה׃
But the people are many, and it is a time of much rain, and we are not able to stand without, neither is this a work of one day or two; for we have greatly transgressed in this matter.
Read midrashic interpretation of Ezra 10:13: and classical rabbinic exegesis.