King James Version (KJV)
Let them curse it that curse the day, who are ready to raise up their mourning.
Modern English
Let those curse it who curse the day, who are ready to rouse up Leviathan.
Hebrew
יִקְּבֻ֥הוּ אֹרְרֵי יֹ֑ום הָעֲתִידִ֥ים עֹ֝רֵ֗ר לִוְיָתָֽן׃
yiqbuhv ʾorrey yovm haʿatiydiym ʿorer livyatan