1 Chronicles 23:31 -

And to offer ; Hebrew, "and for all the offering of burnt offerings." For other references to the help which the Levites gave in the matter of the burnt offerings, and for the number ( 2 Samuel 2:15 ; Numbers 28:1-31 ) of them, see Numbers 29:2-34 ; 2 Chronicles 29:32-34 ; 2 Chronicles 35:2-12 . The priests alone performed the actual sacrifices. The set feasts. These refer to the three:

(1) the Passover (Le 2 Chronicles 23:4 , 2 Chronicles 23:5 );