אֵ֛יךְ נָפַ֥לְתָּ מִשָּׁמַ֖יִם הֵילֵ֣ל בֶּן־שָׁ֑חַר נִגְדַּ֣עְתָּ לָאָ֔רֶץ חוֹלֵ֖שׁ עַל־גּוֹיִֽם׃
How art thou fallen from heaven, O day-star, son of the morning! How art thou cut down to the ground, That didst cast lots over the nations!
Read halakhic rulings (Jewish law) on Isaiah 14:12: and classical halakhic sources.