# assigned the king's portion for the burnt offerings from his own possessions

Hezekiah took the meat and grain used for the burnt offerings out of his own possessions.

# the new moons

This was a festival coinciding with the movement of the moon.

# the fixed festivals

This refers to festivals which occur on specific dates.

# as it was written in the law of Yahweh

This can be stated in active form. Alternate translation: "just as Moses wrote in the law of Yahweh" or "just as Yahweh commanded in his law" (See: [[rc://en/ta/man/translate/figs-activepassive]])