'Act' in the Bible

He may minister to his brothers at the Tent of Meeting by keeping watch, but he is not to engage in service. This is how you are to act with respect to the obligations of the descendants of Levi."

God is not a human male he doesn't lie, nor is he a human being he never vacillates. Once he speaks up, he's going to act, isn't he? Once he makes a promise, he'll fulfill it, won't he?