Leviticus 23:19

19You are also to prepare one male goat as a
sin offering(s): Or purification offering, the sin offering was the most important OT sacrifice for cleansing from impurities. It provided purification from sin and certain forms of ceremonial uncleanness.
sin offering, and two male lambs a year old as a
fellowship sacrifice(s) or offering(s): An animal offering was given to maintain and strengthen a person's relationship with God. It was not required as a remedy for impurity or sin but was an expression of thanksgiving for various blessings. An important function of this sacrifice was to provide meat for the priests and the participants in the sacrifice; it was also called the peace offering or the sacrifice of well-being.
fellowship sacrifice.
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