In modern Dutch, the genitive articles des and der in the bottom line are commonly used in idioms. Other usage is typically considered archaic, poetic or stylistic. One must know whether a noun is masculine or feminine to use them correctly. An example sentence used in some Dutch language courses https://groenenprachtig.nl/waarom-u-een-beedigd-vertaler-nodig-hebt-voor-uw-nederlands-engelse-documenten/