The reason for forbidden mixtures is that God created species in the world - in all of those with spirits, in plants and in animate beings - and gave them the ability to reproduce, such that the species survive with them forever, so long as He, may He be blessed, wants the world to exist. So He commanded that they be able to produce according to their species, and that they never ever change; as it is stated about all of them, "according to its species" (Genesis 1). And this is the reason that we breed animals one with the other; for the continuation of the species - just as men have conjugal relations with women in order to be fruitful and multiply. And one who crosses two species together, changes and denies [God's] act of creation, as if he is thinking that the Holy One, blessed be He, did not perfect His world completely, and he wants to help with His creation of the world [by] adding creatures to it. (Ramban on Leviticus 19,19)
Can anyone please give me the precise Hebrew text of "these" words? Shalom.