|Positive Mitzvah Sixty-One
Offering Only Unblemished Sacrifices
Requires Beit HaMikdash
We are commanded that everything we offer to Hashem is to be perfect in its kind, free from all blemishes mentioned in Torah and from all imperfections regarded as blemishes by Mesorah (Tradition).
The words, "[Besides the continual olah-offering...you shall offer them] - they shall be unto you without blemish - and their drink-offerings," (BaMidbar 28:31) have been quoted as proof that the wines of drink-offerings and their oils and fine flour must be absolutely perfect and free from any flaw whatsoever.
Both the offering and its complement of the Mincha and Drink-offerings must be not only perfect in kind and free from all blemishes whatsoever - they must also be of the very best that the owner possesses (Mishneh Torah, Avodah, Hilchot Issure Mizbeach 7, 1).
According to RaMBaM, one should offer of the finest and of the very best, "...for he that would gain added merit for himself should overcome his yetzer ra to miserliness, and be generously open-handed, so that his offering should be the very finest and most excellent of its kind. The Torah says, 'And Hevel, he also brought of the firstlings of his flock and of the fat thereof. And Hashem had respect unto Hevel and to his offering' (Bereishit 4:4). But the same rule should be observed in regard to every offering we make to Hashem, it must be of the highest excellence and of the very best. The house of prayer one builds must surpass his own dwelling-house; the hungry should be fed of the best and daintiest foods on one's table; the naked should be clothed with the very finest of one's garments, and one should dedicate (to Hashem) only of the best that he possesses - even as Torah declares, 'All the fat is Hashem's' (VaYikra 3:16)" (Mishneh Torah, Avodah, Hilchot Issure Mizbeach 7, 2).