יְֽהוָ֗ה בְּעָזְּךָ֥ יִשְׂמַח־מֶ֑לֶךְ וּ֝בִישׁ֥וּעָתְךָ֗ מַה־יגיל [יָּ֥גֶל] מְאֹֽד׃
O LORD, in Thy strength the king rejoiceth; and in Thy salvation how greatly doth he exult!
Read halakhic rulings (Jewish law) on Psalms 21:2: and classical halakhic sources.