מילון על שבת 139:8

לא תבערו אש YE SHALL NOT KINDLE A FIRE [THROUGHOUT YOUR HABITATIONS ON THEE SABBATH DAY] — There are some of our Rabbis who say that the law about kindling fire is singled out (more lit., goes forth from the general proposition; i. e. it is specially mentioned here although it is included in לא תעשה כל מלאכה, the law prohibiting all work on Sabbath) in order to constitute it a mere negative command (thus indicating that, like all other negative commands, its infringement is punishable by lashes but does not make the offender liable to death as does the doing of other work on Sabbath). Others, however, say that it was singled out in order to separate the various kinds of work comprised in the term כל מלאכה (thus indicating that each transgression of the Sabbath law is to be atoned for separately if several of them have been committed at the same time and under the same circumstances) (cf. Shabbat 70a; Yevamot 6b; Sanhedrin 35b; cf. also Pesachim 5b).