וַיֹּ֕אמֶר מָ֥ה רָא֖וּ בְּבֵיתֶ֑ךָ וַיֹּ֣אמֶר חִזְקִיָּ֗הוּ אֵ֣ת כָּל־אֲשֶׁ֤ר בְּבֵיתִי֙ רָא֔וּ לֹֽא־הָיָ֥ה דָבָ֛ר אֲשֶׁ֥ר לֹֽא־הִרְאִיתִ֖ים בְּאוֹצְרֹתָֽי׃
Then said he: ‘What have they seen in thy house?’ And Hezekiah answered: ‘All that is in my house have they seen; there is nothing among my treasures that I have not shown them.’
Read halakhic rulings (Jewish law) on Isaiah 39:4 from the Mishneh Torah and classical halakhic sources, free online.