וְאֵלַ֣י יֵאָסְפ֗וּ כֹּ֤ל חָרֵד֙ בְּדִבְרֵ֣י אֱלֹהֵֽי־יִשְׂרָאֵ֔ל עַ֖ל מַ֣עַל הַגּוֹלָ֑ה וַאֲנִי֙ יֹשֵׁ֣ב מְשׁוֹמֵ֔ם עַ֖ד לְמִנְחַ֥ת הָעָֽרֶב׃
Then were assembled unto me every one that trembled at the words of the God of Israel, because of the faithlessness of them of the captivity; and I sat appalled until the evening offering.
Read halakhic rulings (Jewish law) on Ezra 9:4: and classical halakhic sources.