This refers to everything associated with the preparation, the sacrifice, and the worship of Yahweh during the Passover. The word "service" can be expressed as a verb and this can be stated in active form. Alternate translation: "they did everything that needed to be done to serve Yahweh" (See: [[rc://en/ta/man/jit/figs-abstractnouns]] and [[rc://en/ta/man/jit/figs-activepassive]])