Ibn Ezra on Leviticus 7:1

וזאת תורת האשם. כבר הודעתיך ההפרש בין חטאת ואשם אף על פי שהכתוב יאמר בחטאת אשם ובאשם חטאת. וטעם להזכיר זאת הפרשה להזכיר החלבים שאין להם זכר בתורת החטאת: AND THIS IS THE LAW OF THE GUILT-OFFERING. I have previously¹See I.E. on Lev. 5:17. explained to you the difference between a sin offering²Hebrew, chattat. and a guilt offering.³Asham. [There is a difference between the two] even though Scripture employs the term guilt when referring to a sin offering⁴See Lev. 5:6, And he shall bring his forfeit (ashamo)…for his sin. Also Lev. 4:13, 14, And are guilty (ve-ashemu)…then the assembly shall offer…a sin-offering. and the word sin when referring to a guilt offering.⁵See Lev. 5:17,18, And if any one sin…And he shall bring a ram…for a guilt-offering. Scripture records this section⁶The section dealing with the law of the guilt offering (verses 1-7). because it wants to make mention of the fat,⁷Of the guilt offering. to which no reference is made when Scripture earlier records the law of the sin offering.⁸In the previous Torah portion, Va-Yikra. There the Torah deals with sin and guilt offerings.