8:20 altar . . . burnt offerings. Significantly, Noah’s first act after emerging from the ark was to worship God. Though mentioned here for the first time, these aspects of the sacrificial system are presupposed (7:2 note). The burnt offering signified dedication to God and propitiation for sin (v. 21 note; Lev. 1:4; 6:8–13).
clean. See note 7:2.