וַיֵּרָפ֣וּ הַמַּ֔יִם עַ֖ד הַיּ֣וֹם הַזֶּ֑ה כִּדְבַ֥ר אֱלִישָׁ֖ע אֲשֶׁ֥ר דִּבֵּֽר׃ (פ)
So the waters were healed unto this day, according to the word of Elisha which he spoke.
Read halakhic rulings (Jewish law) on II Kings 2:22: and classical halakhic sources.