וְאֹ֣רַח צַ֭דִּיקִים כְּא֣וֹר נֹ֑גַהּ הוֹלֵ֥ךְ וָ֝א֗וֹר עַד־נְכ֥וֹן הַיּֽוֹם׃
But the path of the righteous is as the light of dawn, That shineth more and more unto the perfect day.
Read halakhic rulings (Jewish law) on Proverbs 4:18: and classical halakhic sources.