sn Kindling a fire receives special attention here because the people thought that kindling a fire was not work, but only a preparation for some kind of work. The Law makes sure that this too was not done. But see also G. Robinson, “The Prohibition of Strange Fire in Ancient Israel: A Look at the Case of Gathering Wood and Kindling Fire on the Sabbath,” VT 28 (1978): 301–17.
sn The presence of these three verses in this place has raised all kinds of questions. It may be that after the renewal of the covenant the people needed a reminder to obey God, and obeying the sign of the covenant was the starting point. But there is more to it than this; it is part of the narrative design of the book. It is the artistic design that puts the filling of the Spirit section (31:1–11) prior to the Sabbath laws (31:12–18) before the idolatry section, and then after the renewal there is the Sabbath reminder (35:1–3) before the filling of the Spirit material (35:4–36:7).