Halakhah sobre Êxodo 19:18

It is from the roots of the commandment that God, blessed be He, created His world with wisdom, with understanding and with knowledge, and [so] He made and formed all of the forms according to that which it was fitting for its matter to be, to be designed [according to] the design of the world - and blessed is He that knows [this]. And this is what is stated about the story of creation (Genesis 1:31), "And God saw everything that He had done, and behold, it was very good." And His seeing, blessed be He, is His knowledge and contemplation about things; as He, blessed be He, does not need seeing things with the eye after the act, due to His great level; since everything is revealed and known and apparent in front of Him before the act, [just] like after the act. But the Torah speaks to people with words directed to them, and it calls things by the name of things that are aimed at them, as it only possible to speak with a creature with what is known to him - as who can understand what he does not have the power to understand? And about what is similar to this, they, may their memory be blessed, said (Mekhilta d'Rabbi Yishmael 19:18:2), [it is] in order to break [to assuage] the ear to that which it can hear. And in that God knew that everything He made was designed perfectly for its matter that it needed in His world, He commanded to each and every specie to make its 'fruit' for its specie - as it is written in the Order of Bereshit - and that the species not mix, lest it will take away from their perfection and He [therefore] not command His blessing upon them. And according to what it seems in our thoughts, it is from this root that we were prevented from mating beasts [in a] forbidden mixture. And likewise from this reason were we warned about this, combined with another reason that we already wrote about species of seeds and trees (Sefer HaChinukh 62).