Spiritual Gems from the parsha Vayikra

And if you bring a meal-offering baked in the oven (Lev. 2:4)

In order to become closer to G-d, a person should arouse his innate, fiery love of Him by contemplating the greatness of the Creator. For in the same way that an oven's heat causes the liquid to separate from the dough, so too does a burning love of G-d separate a person from his attraction to material things and strengthen his connection with the infinite.

(Likutei Sichot)
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And it shall be that when he has sinned and is conscious of his guilt, he shall restore that which he took by robbery (Lev. 5:23)

Our Sages note that whenever the Torah uses the phrase "And it shall be," it indicates joy and happiness. But what possible joy can there be in a discussion of robbery? Rather, the positive point in this verse is that the robber "is conscious of his guilt." It is a good thing that he recognizes the need to repent of his sin and bring an offering to atone for his misdeed.

(Ilana D'Chayei)
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And if he denies unto his neighbor that which was delivered to him to keep, or in pledge, or in something taken by violence...he shall give it to the one it belongs to on the day he confesses his sin (Lev. 5:21, 24)

The Torah advises the robber to return whatever he stole on the same day that he admits his crime. The longer he waits, the harder it will be for him to give it up.

(Maadanei Asher)
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And the priest shall make atonement for him...for anything of all that he may have done to trespass thereby (le'ashma ba) (Lev. 5:26)

"Le'ashma ba" is an acronym standing for "La'keil asher shavat mikol hamaasim bayom hashevi'i" - "to G-d, Who rested from all His deeds on the seventh day." This is an allusion to our Sages' dictum that "Whoever keeps the Shabbat properly is forgiven all his sins." Thus, even in exile, when we have no physical Holy Temple in which to offer sacrifices, our observance of Shabbat atones for sins in the same way.

(Tiferet Shlomo)