וְרַק־אַתֶּם֙ שִׁמְר֣וּ מִן־הַחֵ֔רֶם פֶּֽן־תַּחֲרִ֖ימוּ וּלְקַחְתֶּ֣ם מִן־הַחֵ֑רֶם וְשַׂמְתֶּ֞ם אֶת־מַחֲנֵ֤ה יִשְׂרָאֵל֙ לְחֵ֔רֶם וַעֲכַרְתֶּ֖ם אוֹתֽוֹ׃
And ye, in any wise keep yourselves from the devoted thing, lest ye make yourselves accursed by taking of the devoted thing, so should ye make the camp of Israel accursed, and trouble it.
Read halakhic rulings (Jewish law) on Joshua 6:18: and classical halakhic sources.