Chasidut zu Wajikra 9:17

In Parshat Tzav, when the respective sacrifices known as ‎עולה‎, burnt offering, where the entire animal is burned up on the ‎altar, and ‎חטאת‎, sin offering for inadvertent violation of many ‎otherwise severely punishable sins are discussed, the Torah first ‎legislates details of the sin offering. The reason for this apparently ‎inverted order, is that although the ‎עולה‎ offering is considered as ‎of a higher order, the sin offering symbolizes what we have ‎elsewhere already described as the ‎אור ישר‎ direct light, original ‎illumination stemming from the highest celestial regions, whereas ‎the ‎עולה‎ symbolizesאור חוזר ‏‎, reflected light, light containing a ‎human response to the original light. The reason that the entire ‎body of the animal used in the ‎עולה‎ offering is burned up, so that ‎the ‎ריח ניחוח‎, pleasant fragrance rises heavenwards, is because it ‎proves that man has responded positively to the gift of the ‎‎“original light.”‎
This is also the meaning of the line in Leviticus 9,17: ‎ויקרב את ‏העולה ויעשה כמשפט‎, “He presented the total offering and ‎performed its ritual in accordance with the rules pertaining to it;” ‎The author hints at a parallelism with the letters in the word ‎תשרי‎ ‎in which the letters (excluding the last which symbolizes the ‎name of G’d) appear in the reverse order of the alphabet. The first ‎day of ‎תשרי‎, New Year’s Day, is the day on which we creatures ‎return to G’d in repentance, i.e. we send out ‎אור חוזר ‏‎,“reflected ‎light,” proof that we can respond to G’d’s great kindness in ‎having illuminated our universe with direct light from His ‎essence. ‎