The burnt offering
Archimandrite Nikifor’s Biblical Encyclopedia
(Gen. 8:20 [as given]; 22:2; Exod. 29:42, and elsewhere). This was the most common and universal sacrifice among the Hebrews. It is first mentioned in Holy Scripture at the sacrifice offered by Noah upon his coming forth from the ark (Gen. 8:20). It consisted in this, that the entire sacrificial animal was burned, together with all its parts, with the exception of the hide. The details of the offering of this sacrifice, as well as the animals used and their required qualities, are noted above.
It signified that the one offering this sacrifice offered up everything — his whole self, both soul and body — and it was the preeminent foreshadowing of the sacrifice of Christ. For thus the Messiah was one day to offer Himself as a sacrifice for the sins of mankind, for their salvation (Heb. 9:9, 14, and elsewhere).