"shall you slaughter and you shall eat": and not shear.

I might think that it is forbidden (to shear them even) after slaughtering; it is, therefore, written "according to the blessing of the L-rd your G-d" (i.e., derive as much benefit from them as is consistent with their status.)

I might think that (even) if a permanent blemish preceded their dedication, and they were redeemed, they would be forbidden (to shear); it is, therefore, written "Only (with all the desire, etc.", to exclude this).

Whence is it derived that it is permitted to slaughter them only if they sustained a permanent blemish (and not a passing one). Would you say that (i.e., that a derivation is needed)? It follows a fortiori, viz.: If a bechor (a first-born) — which (i.e., whose sanctity) does not obtain with all births, and which (if it were blemished) it becomes chullin (mundane, non-sacred) without redemption — (If a bechor) is slaughtered only if it sustained a permanent blemish — then consecrated animals, which obtain (i.e., whose sanctity obtains) with all births (and not only with first-born), and which become chullin only with redemption — how much more so should they be slaughtered only if they sustained a permanent blemish! — No, (i.e., this does not follow.) It may be true of a bechor, whose sanctity is from the womb and obtains even with one that is permanently blemished (i.e., it may be slaughtered only if it sustained a permanent blemish), but would you say the same (i.e., that they may not be slaughtered only if they sustained a permanent blemish) for consecrated animals, whose sanctity is not from the womb and does not obtain with those that are permanently blemished? It is, therefore, written (here) "that He has given you in all of your gates," and, elsewhere (in connection with a bechor that sustained a blemish, [Ibid. 15:22]) "In your gates may you eat it" — "gates" - "gates" for an identity (gezeirah shavah), viz.: Just as there, (re bechor), it is not slaughtered unless it sustained a permanent blemish, (viz. [Ibid. 21] "lame or blind,") so, here (re offerings in general), they are not slaughtered unless the blemish were permanent.