"and bechoroth": the first-born. What does Scripture come to teach us? If (that it is forbidden) to eat a bechor outside the wall, this can be derived a fortiori from ma'aser (as above); if before its blood has been sprinkled, this can be derived a fortiori from a thank-offering and peace-offerings, viz.: If a thank-offering and peace-offerings, which are permitted to non-priests — if one eats of them before their blood has been sprinkled, he transgresses a negative commandment, then a bechor, which is forbidden to non-priests, if one eats of them before their blood has been sprinkled, how much more so does he transgress a negative commandment!
The purpose of the verse, then, must be to teach us that if a non-priest eats of it (even) after the sprinkling of the blood, he transgresses a negative commandment.