וַנִּתְפַּלֵּ֖ל אֶל־אֱלֹהֵ֑ינוּ וַנַּעֲמִ֨יד מִשְׁמָ֧ר עֲלֵיהֶ֛ם יוֹמָ֥ם וָלַ֖יְלָה מִפְּנֵיהֶֽם׃
But we made our prayer unto our God, and set a watch against them day and night, because of them.
Read midrashic interpretation of Nehemiah 4:3: and classical rabbinic exegesis.