He was directly appointed by Jehovah to do so. He is the only one mentioned in the Hebrew Scriptures who served as both a king and a priest.
ಅವನಿಗಿಂತ ಮುಂಚೆ ಮತ್ತು ನಂತರ ಬೇರೆ ಯಾರೂ ಈ ಎರಡೂ ಸ್ಥಾನಗಳಲ್ಲಿ ಇದ್ದಿದ್ದರ ದಾಖಲೆಯಿಲ್ಲ.