When reading Leviticus there is a lot information about burnt offerings and animal sacrifices. It makes you wonder what the significance of this is, and why God looked favorably upon those who did it.
This site has a good explanation. Basically reinforcing the theme from the Bible, “without the shedding of blood there is no forgiveness” (Hebrews 9:22).” https://www.gotquestions.org/animal-sacrifices.html
This website has a lot of great info and this quote sums it up well, “Why does God take notice of every drop of blood that gets spilt? Because life is in the blood: “For the life of the flesh is in the blood, and I have given it to you upon the altar to make atonement for your souls; for it is the blood that makes atonement for the soul’” (Leviticus 17:11). God called for the blood sacrifice of animals because He was teaching His people about the cost of sin.” Check out this site for a wealth of information: https://keltonburgpreacher.wordpress.com/2012/07/13/why-did-god-require-animals-to-be-sacrificed/