בַּיָּמִ֣ים הָהֵ֔ם חָלָ֥ה יְחִזְקִיָּ֖הוּ עַד־לָמ֑וּת וַיִּתְפַּלֵּל֙ אֶל־יְהוָ֔ה וַיֹּ֣אמֶר ל֔וֹ וּמוֹפֵ֖ת נָ֥תַן לֽוֹ׃
In those days Hezekiah was sick even unto death; and he prayed unto the LORD; and He spoke unto him, and gave him a sign.
Read halakhic rulings (Jewish law) on II Chronicles 32:24: and classical halakhic sources.