וַיְהִ֕י מֵֽהַיּ֥וֹם הַה֖וּא וָמָ֑עְלָה וַיְשִׂמֶ֜הָ לְחֹ֤ק וּלְמִשְׁפָּט֙ לְיִשְׂרָאֵ֔ל עַ֖ד הַיּ֥וֹם הַזֶּֽה׃ (פ)
And it was so from that day forward, that he made it a statute and an ordinance for Israel unto this day.
Read kabbalistic (mystical) interpretation of I Samuel 30:25: and classical mystical sources.