Midrash su Levitico 22:22

1) "you shall not present": If (the meaning is) that you shall not designate as sacred, this is already stated above (Vayikra 21:20). Its intent must be, then, that you shall not slaughter.

2) "you shall not present these to the L–rd.": These you shall not present, but you may present animals designated as sacred with which work was done.

3) (For, without the verse) it would follow otherwise, a fortiori, viz.: If the red heifer, which is not invalidated by a blemish is invalidated by having been worked with, then offerings, which are invalidated by blemishes, how much more so should they be invalidated by having been worked with! It is, therefore, written "These" — These you shall not present (as offerings), but you may present animals which have been worked with.