וַיֹּ֤אמֶר חִזְקִיָּ֙הוּ֙ אֶֽל־יְשַׁעְיָ֔הוּ ט֥וֹב דְּבַר־יְהוָ֖ה אֲשֶׁ֣ר דִּבַּ֑רְתָּ וַיֹּ֕אמֶר כִּ֥י יִהְיֶ֛ה שָׁל֥וֹם וֶאֱמֶ֖ת בְּיָמָֽי׃ (פ)
Then said Hezekiah unto Isaiah: ‘Good is the word of the LORD which thou hast spoken.’ He said moreover: ‘If but there shall be peace and truth in my days.’
Read halakhic rulings (Jewish law) on Isaiah 39:8 from the Mishneh Torah and classical halakhic sources, free online.