Yahweh had commanded Moses that all the people of Israel were to go to Jerusalem to celebrate the Passover.
# the fourteenth day of the first month
This is the first month of the Hebrew calendar. The fourteenth day is near the beginning of April on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-ordinal]])
# He placed the priests in their positions
Placing the priests in a position is a metaphor for telling the priests which jobs they are to do. The reader should probably understand that Josiah commanded his officials to give instructions to the priests. AT: "He had people tell the priests which jobs to do" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-metonymy]])
The abstract noun "service" can be translated as a verb. AT: "as they served in" or "to serve well in" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])