כִּֽי־תֵצֵ֥א מַחֲנֶ֖ה עַל־אֹיְבֶ֑יךָ וְנִ֨שְׁמַרְתָּ֔ מִכֹּ֖ל דָּבָ֥ר רָֽע׃
When thou goest forth in camp against thine enemies, then thou shalt keep thee from every evil thing.
Read halakhic rulings (Jewish law) on Deuteronomy 23:10: and classical halakhic sources.