Ezra 4:18 Halakhah

נִשְׁתְּוָנָ֕א דִּ֥י שְׁלַחְתּ֖וּן עֲלֶ֑ינָא מְפָרַ֥שׁ קֱרִ֖י קָדָמָֽי׃

the letter which ye sent unto us hath been plainly read before me.

Read halakhic rulings (Jewish law) on Ezra 4:18: and classical halakhic sources.