Hilchos Maasei Hakarbanos 3:15

He confessed by saying, “I sinned, I violated, I transgressed, and I did such-and-such. I have repented before You and this is my atonement.” One who brought a peace offering could lay his hands with all his strength anywhere he wished in the courtyard, where the animal would be slaughtered. The Rambam opines that instead of confessing on a peace offering, one would offer words of praise.

Hilchos Maasei Hakarbanos 4:1

All sacrifices may only be offered by day, as derived from Leviticus 7:38: “On the day He commanded the children of Israel to offer their sacrifices” – day but not night. Accordingly, offerings are only slaughtered by day and their blood is sprinkled on the altar that same day, as per Leviticus 7:16: “On the day he offers his sacrifice.” We see that the sacrifice is offered on the day it is slaughtered. Once the sun sets, the blood becomes unfit.