‘Now if anyone of the common people sins unintentionally in doing any of the things which the Lord has commanded not to be done, and becomes guilty, if his sin which he has committed is made known to him, then he shall bring for his offering a goat, a female without defect, for his sin which he has committed. He shall lay his hand on the head of the sin offering and slay the sin offering at the place of the burnt offering. The priest shall take some of its blood with his finger and put it on the horns of the altar of burnt offering; and all the rest of its blood he shall pour out at the base of the altar. Then he shall remove all its fat, just as the fat was removed from the sacrifice of peace offerings; and the priest shall offer it up in smoke on the altar for a soothing aroma to the Lord . Thus the priest shall make atonement for him, and he will be forgiven. ‘But if he brings a lamb as his offering for a sin offering, he shall bring it, a female without defect. He shall lay his hand on the head of the sin offering and slay it for a sin offering in the place where they slay the burnt offering. The priest is to take some of the blood of the sin offering with his finger and put it on the horns of the altar of burnt offering, and all the rest of its blood he shall pour out at the base of the altar. Then he shall remove all its fat, just as the fat of the lamb is removed from the sacrifice of the peace offerings, and the priest shall offer them up in smoke on the altar, on the offerings by fire to the Lord . Thus the priest shall make atonement for him in regard to his sin which he has committed, and he will be forgiven.
Leviticus 4:27-35 NASB
http://bible.com/100/lev.4.27-35. NASB
Here we see that sacrifice for the common person could be either a female sheep or goat. These were less costly, which seems to indicate the importance of sin in a leader. But it also speaks to God’s provision. Those in leadership were likely to have more possessions than the commoner. Later on we will see alternative sacrifices for those who were really poor. The takeaway is that God will not demand something He has not provided. Likewise, everything we have is provided by God.