וַיֹּ֣אמֶר יְהוֹשֻׁ֔עַ גֹּ֛לּוּ אֲבָנִ֥ים גְּדֹל֖וֹת אֶל־פִּ֣י הַמְּעָרָ֑ה וְהַפְקִ֧ידוּ עָלֶ֛יהָ אֲנָשִׁ֖ים לְשָׁמְרָֽם׃
And Joshua said: ‘Roll great stones unto the mouth of the cave, and set men by it to keep them;
Read halakhic rulings (Jewish law) on Joshua 10:18: and classical halakhic sources.